Version 0.2.1 release

[valentinsulzer]

Description

Changelog and version number increment for new release.
Also includes small bug fixes in simulation and quickplot

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ flake8
• All tests pass: $ python run-tests.py --unit
• The documentation builds: $ cd docs and then $ make clean; make html

You can run all three at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

Merging #930 into develop will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #930      +/-   ##
===========================================
+ Coverage    98.04%   98.04%   +<.01%     
===========================================
  Files          216      216              
  Lines        11116    11117       +1     
===========================================
+ Hits         10899    10900       +1     
  Misses         217      217

Impacted Files	Coverage Δ
pybamm/simulation.py	97.03% <100%> (-0.02%)	⬇️
pybamm/quick_plot.py	100% <100%> (ø)	⬆️
pybamm/solvers/solution.py	99.2% <100%> (ø)	⬆️

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