Bug fix release

[znicholls]

@danielhuppmann or @gidden any chance of a hotfix release? At the moment pip installing doesn't work because you get pandas 0.25 which is really annoying

cc @lewisjared

[jkikstra]

@gidden @danielhuppmann I've also just bumped into this issue when installing ixmp and message_ix from source code, then manually doing 'pip install pyam-iamc' and pip install .[tests,reporting] and then running py.test tests:

=============================================== test session starts ================================================
platform win32 -- Python 3.7.3, pytest-5.2.0, py-1.8.0, pluggy-0.13.0
message_ix location: C:\Users\kikstra\AppData\Local\Continuum\anaconda3\lib\site-packages\message_ix
ixmp config: {'DB_CONFIG_PATH': None, 'DEFAULT_DBPROPS_FILE': None, 'DEFAULT_LOCAL_DB_PATH': WindowsPath('C:/Users/kikstra/.local/share/ixmp/localdb/default')}
rootdir: C:\Users\kikstra\Documents\GitHub\message_ix
plugins: arraydiff-0.3, doctestplus-0.4.0, openfiles-0.4.0, remotedata-0.3.1
collected 59 items / 1 errors / 58 selected

====================================================== ERRORS ======================================================
_____________________________________ ERROR collecting tests/test_reporting.py _____________________________________
ImportError while importing test module 'C:\Users\kikstra\Documents\GitHub\message_ix\tests\test_reporting.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
tests\test_reporting.py:15: in <module>
    import pyam
..\..\..\AppData\Local\Continuum\anaconda3\lib\site-packages\pyam\__init__.py:1: in <module>
    from pyam.core import *
..\..\..\AppData\Local\Continuum\anaconda3\lib\site-packages\pyam\core.py:17: in <module>
    from pyam import plotting
..\..\..\AppData\Local\Continuum\anaconda3\lib\site-packages\pyam\plotting.py:37: in <module>
    from pandas.plotting._style import _get_standard_colors
E   ModuleNotFoundError: No module named 'pandas.plotting._style'
================================================= warnings summary =================================================
C:\Users\kikstra\AppData\Local\Continuum\anaconda3\lib\site-packages\_pytest\config\__init__.py:545
  C:\Users\kikstra\AppData\Local\Continuum\anaconda3\lib\site-packages\_pytest\config\__init__.py:545: PytestAssertRewriteWarning: Module already imported so cannot be rewritten: ixmp.testing
    self.import_plugin(import_spec)

-- Docs: https://docs.pytest.org/en/latest/warnings.html
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 errors during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
=========================================== 1 warnings, 1 error in 0.99s ===========================================

[byersiiasa]

Same occurs with the conda-forge install. Seems that only git master avoids this error

[khaeru]

We have new users such as @jkikstra trying to use the message_ix reporting features to convert to pyam. Because #246 is still unreleased, I have to inform them to work around by installing master.

[Jihoon]

I am also having this issue.

[gidden]

Hi all - with #277 I think we are ready to do a release (also to help backups with silicone, openscm, etc.). @danielhuppmann can you take us across the finish line here?

[danielhuppmann]

resolved with release 0.3.0, https://github.com/IAMconsortium/pyam/releases/tag/v0.3.0