Bump version: 0.2.1 --> 0.2.2

[JulienPeloton]

0.2.2

• Add the conversion from FITS file (single HDU) to parquet (PR)
• Tools to perform live 3D RDD visualisation (in progress) (PR)
• Several updates to the Travis CI (PR)
• Add example dealing with collapse function in pyspark (PR)
• Deploy pyspark3d with pip (PR)
• Clarify the use of get_spark_session and load_user_conf (for tests only!) (PR)

[codecov-io]

Codecov Report

Merging #100 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #100   +/-   ##
=======================================
  Coverage   96.37%   96.37%           
=======================================
  Files          32       32           
  Lines        1240     1240           
  Branches      217      217           
=======================================
  Hits         1195     1195           
  Misses         45       45

Flag	Coverage Δ
#python	94.3% <ø> (ø)	:arrow_up:
#scala	97.24% <ø> (ø)	:arrow_up:

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