Bump version (bug fix): 0.7.0 -> 0.7.1

[JulienPeloton]

0.7.1

• Solve the multifile problem that was seen in On the multifile problem in spark-fits #54
• Reduce a potential large overhead when reading many files, due to schema checks.

Left for later: see #56 and #54

[codecov-io]

Codecov Report

Merging #57 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #57   +/-   ##
======================================
  Coverage    89.3%   89.3%           
======================================
  Files           9       9           
  Lines         477     477           
  Branches       88      88           
======================================
  Hits          426     426           
  Misses         51      51

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