Numba

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The main changes in this release are the removal of specific code for Python 2
and Python <3.6, and making the code base PEP8 compliant.

Pull requests:

* PR 577: llvmlite wheel building fixes
* PR 560: ENH: Better error message
* PR 558: update install docs
* PR 556: binding: Allow empty features list
* PR 555: travis: Cleanup
* PR 554: azure-pipelines: Bump VM images.
* PR 552: Add paragraph on installing from sdist and on non-traditional
platforms.
* PR 551: Remove python 2, python < 3.6, fix up, add flake8
* PR 549: Miscalled method and missing parameter in the documentation
* PR 547: Permit building on Visual Studio 2017
* PR 543: Update error message in LLVM version check.
* PR 540: update to final release date for 0.31.0

Authors:

* Arik Funke
* Eric Larson
* Jan Vesely
* Shan Sikdar
* Siu Kwan Lam (core dev)
* Stan Seibert (core dev)
* Stuart Archibald (core dev)
* Vladislav Hrčka

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This release switches memset/memcpy to use the 4 argument style as per LLVM 7+
and updates some documentation.

Commits:

* PR 485: Revert "Revert "LLVM 7 changed memset intrinsic signature, adjust
it""
* PR 520: Begin development of 0.31.0
* PR 528: Add cttz and ctlz to irbuilder docs.
* PR 533: Update deprecation docs with full deprecation of 5 arg memset/memcpy
* PR 535: Update docs to not report LLVM 3.8 as latest!

Authors:

* Isaac Virshup
* Siu Kwan Lam (core dev)
* Stuart Archibald (core dev)

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This release adds support for half-precision float and schedules the
deprecation of memset/memcpy accepting 5 arguments (cf. LLVM change).

* PR 518: Fix use of -fPIC flag in wheels
* PR 513: Remove restriction on sphinx version from Anaconda distro
* PR 512: fix for block labels which contain "interesting" characters
* PR 511: Deprecate the use of memset/memcpy with alias
* PR 510: Add fp16 Intrinsics
* PR 509: Add Half-Precision Type
* PR 502: Add -fPIC flag for manylinux1 wheel building
* PR 491: Fix incorrect hierarchy in the documentation for ir.Constant.
* PR 474: Update docs
* PR 470: Fix leak on string returning APIs.

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This release upgrades to LLVM 8.0 for all supported platforms except PPC64LE.
Due to numerous problems with LLVM 8.0 running on PPC64LE,
we have decided to use LLVM 7.1, which is more stable on PPC64LE.
In addition, non-host LLVM targets, AMDGPU, NVPTX, and WebAssembly, are enabled
and they are available in our `llvmlite` builds.

* PR 484: Revert "LLVM 7 changed memset intrinsic signature, adjust it"
* PR 483: Depend on enum34 using PEP 508 environment markers
* PR 478: Upgrade to llvm8
* PR 469: Support loading from current directory and egg files
* PR 467: Add missing fastmath flags from LLVM 7
* PR 460: LLVM 7 changed memset intrinsic signature, adjust it

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This release adds a number of community contributed features, including
support for vector types, as well as atomic loads and stores.

* PR 322: Adding Vector Type
* PR 389: Add symbols from static object files
* PR 417: Add support for atomic loads/stores
* PR 422: Normalize replace_* behaviour and add docs
* PR 426: Fix pickling of IR functions and add tests
* PR 444: Setup manylinux1 buildscripts and CI
* PR 446: Document need for -p1 argument to patch command
* PR 448: Fix "SyntaxWarning: invalid escape sequence \d"
* PR 449: Consolidate the two vector type PRs
* PR 452: Some adjustments to pr426
* PR 454: Truncate long label names when adding label suffix.
* PR 458: Add changelog info about v0.27.1

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Bugfix release for invalid wheel hash for OSX packages.
No change to source code.