Changes:
* 471d0aaaaa8574b9a1da2302e992f61b01e3d155 update release date for R-package
* 102893a11c1dd712bb70d87b3b129ddf42daf06f [R-package] fixed minor issues with tests and documentation (2581)
* 16c551c13d49c03fd4d871418257b1d89569d95b [docs] updated instructions in examples to match ones from ranking example (2585)
* 49df9e60d742ca7be8a7aad65f9a6b2519883819 [docs] Update LambdaRank example documentation (2548)
* 6a3e27df0348a727c5b02a18b13579129da01102 Avoid the issue is labeled to bug by default.
* a6ba859ed5ec19e8af0704c1b9ab7c65684b3f35 [R-package] fixed parameter-name typo in lgb.cv() (2576)
* 1f7b06b98391395b6fd2f0bd7937353254718956 [R-package][ci] Added more R linters (fixes 2477) (2533)
* 11f9682bb72dea34313758f054ccf37886dc7e6e Fix build error when HDFS is enabled. (2540)
* 26ff099ab47cd98f7613503ff5976f7359e3465b explicitly import `std::max` from <algorithm> (2562)
* a8dc03250e235a00baf3ecefe4155023624dd239 [ci] fixed cpplint warning about parenthesis placement (2563)
<details><summary><b>See More</b></summary>
* 41c366ee6b69571202ffbdca5965219cb6cf0ac4 [R-package] [ci] pin roxygen2 version for RTD (2568)
* cf8c8c0b9bdedb9c0226123b6d0d716da108e3be Fix detecting alias of objective in loading from model strings (2565) [ 2564 ]
* 3e3d76f64bfa3d95f9769bd82be7124158ff3df7 [Java] MMLSPARK-ISSUE-720 - Create SWIG version of BoosterDumpModel that returns string to be used in Java (2560)
* 7feaaefb5b730524d12449e48d93a862a668a024 [docs][docker] cleaned up CODEOWNERS and fixed build warning in dockerfile-python (2555)
* 31bec2fb3dd7f20ea995734bace8b378467949b8 addressed linting items about empty statements (2545)
* a94275120f37e3bbb74d63f50a6838b8926c7fec [R-package] removed unnecessary Suggests dependencies (2543)
* b2da19b88df1a8d014a9e1b46086e2def20ad4d8 check feature names for special JSON chars (2557)
* 83ecb38600e99fb017c51af805b32b13f262d764 [docker] install ca certificates package on ubuntu image (2554)
* 76bda1e25740d79d03aadbaeba5aecd0551bde6c support Catalina (2556)
* 785e477856b9e9e9e69123caf175dbb8455c3b11 [ci] removed temp fix for Graphviz from conda (2551)
* 7cfb492e7733f73526fbf8958d850bbb94af83ed [ci][R-package] removed outdated comment in lint_r_code.R (2541)
* 516bd37a28a0dfa7c2bc4a24587dbbcb8a697eb2 renamed variables from bias to offset (2539)
* bd7e1842042ff38dfe3f89e67021479cf2d21f0d [docs] refactored News section in README (2529)
* a36eb7e76f7ff6e80358aabfd2b6f1b2c04ad41d remove many vector.at()
* 8f7199a44b290a13e8b4a82eb45f7389785c26fe [docs] update MS-MPI link (2528)
* 1f1dc4521e2556f79664274b61da0e2d78325964 [tests][python] refined python tests (2483)
* 00d1e6938a3f8566526d470057f8d26ec1289208 [python] removed unused pylint directives (2466)
* f1d4e449b7f7b8b20fa04b694a976961f81a3728 fixed casting warning (2523)
* 85be04a62a961ed8f1a4012d6480e3b2c986880a [R-package] Disabled early stopping when using 'dart' boosting strategy (2443)
* fc991c9d7e07fd8e460ea24d1f5609f61fd2af3f [R-package] added R linting and changed R code to comma-first (fixes 2373) (2437)
* b4bb38d9267ccc966f0bb8cdd6e2eece2b4c08e3 [R-package] Added unit tests (2498)
* bdc310a8a4860772327aae539eff30f9db8fd673 [R-package] Sort indices in lgb.cv() (fixes 2503) 2524
* 44b0acacb2ddcd25482c6002e9ed68ce4a711c91 [ci] removed temp fix 2522
* 5dcd4be924b54dfa36bd564338a4199e61bb17ed [python] handle params aliases centralized (2489)
* fbf95687adfe1518bfff722bced1cd5d1c30cb54 [ci] reduced number of commits cloned to CI environments (2495)
* 465d1262eb1d8eb3cfa7cc505140c035e52c8118 check sorted indices in Subset (2510)
* 198d0f3bf1d7f183aabaa6ee7d9cc145dd944dcc [docs] added m2cgen in README (2512)
* 72027036a978e0f455304ae9963b7bf3b9c2eb4c [docs] removed misleading section about pep8 in python's readme (2507)
* 2c3ebd94dc959259ebb3703737e6029d77b63b30 [ci] miniconda installer hotfix (2511)
* b1c50d07cee4f6042a5d50c2c92ca81b321b000b [docs] added logos to badges (2506)
* 40e56ca7aea0d385c149ff3da4cad7067221df38 reduce the buffer when using high dimensional data in distributed mode. (2485)
* 4848776fb1940adb4423ba27d7c152bba06cd9cf [docs] clarified support of LibSVM zero-based format files (2504)
* b0500dde9a108701623cb80ef5e92006aca35c10 [python] DPI arg in plotting functions (2491)
* dc5840709909bc18df437cddf62677f7be2915a4 fix bug in parser
* fdb39237f69ea82091d27d2504da08abd323b4dc updated dockers (2459)
* d7f8aa53b8be5212887e97e474c90bc5d8beac19 [docs] fixed miscellaneous typos in comments and documentation (2496)
* ff4e48ce53f20f8546d7067b6804810ca5f79c07 reworked GitHub issue templates (2492)
* 780a3fdf2fd06c39c3d93230bce99c3d4174fd17 [ci] removed temp fix for missing package (2493)
* dee72159d36a66d72372ec7fa783d1682eef1411 check the shape for mat, csr and csc in prediction (2464)
* dc65e0ac6ee8faa5790263a8dc2d9cc2a8dd7c4b [ci] fixed whitespace cpplint issue in auto-config (2488)
* 67099ff8a79681a1965160efcbec76ca8f7a2c30 [ci] added build/c++11 to cpplint filter (2487)
* c1a7b291c5621030c43cba4a8182e9199ed08e67 [python] removed deprecated code (2474)
* 9b61166fccab1edc92edebc97ef6714018736b18 fixed cpplint errors about spaces and newlines (2481)
* 6036e07d1fa049b184bd70f23ec9923038b6d88c [ci] move Clang linking into docker (2476)
* e6505417eff10d1bae863d72d2a08469afc19e04 [ci] removed outdated code (2475)
* 54be4204a02384a6c9655b8290845174600af54b [docs] updated problem link 2473
* 5c0daca0a1ae601aa2bdcaa0d2fc16bcf3be150a [ci] use the latest versions of OSes at Travis (2467)
* 3d407b67e5006deb1a63d2ded8a9e430ff86cafb new version number after release (2469)
* 42204c43da08ddacd0fa98a9e43d2c56ec8b9fb9 [R-package] factored dependency 'magrittr' out of R package (2334)
This list of changes was [auto generated](https://dev.azure.com/lightgbm-ci/lightgbm-ci/_build/results?buildId=3617&view=logs).</details>