Lfpykit

This bugfix/feature release candidate contains the following changes since https://github.com/LFPy/LFPykit/releases/tag/v0.2
c55e824 (HEAD -> master, tag: v0.3rc1, origin/master, origin/HEAD) Fix for z_shift (110)
88eb71c Pull request target (113)
3eae706 (torbjone/master) 0.3rc1 (109)
ca7aeb6 Add conda-forge install/release info (107)
a2e089a add coveralls (106)
3bc6d74 removed travisci test script (105)
8dae6ab fetch build status from travis-ci.com (103)
ac06125 turned refs to LFPy2.2.dev0 into LFPymaster (101)

This bugfix/feature release incorporates the following changes since the 0.1 release (https://github.com/LFPy/LFPykit/releases/tag/v0.1):
14bf010 (HEAD -> master, tag: v0.2rc1, origin/master, origin/HEAD) version 0.2rc1
befedb8 package test scripts (98)
a8e45a4 removed test which duplicates test in LFPy2.2.dev0 (96)
cb12425 added VolumetricCurrentSourceDensity class (94)
a2ab9a1 add python3.9 to travisCI, provide wheels (91)
b8f08d3 use official NEURON from PyPI (89)
e9a22b5 version bump (87)
63eb35a Fix assert statements (86)