Release Parquet-mr 1.8.3

[asfimport]

Please link needed issues as blockers.

Reporter: Gabor Szadovszky / @gszadovszky
Assignee: Gabor Szadovszky / @gszadovszky

Related issues:

• Incorrect handling of missing values in Statistics (is blocked by)
• Ignore float/double statistics in case of NaN (is blocked by)
• Travis fails on branch 1.8.x (is blocked by)

_{Note: This issue was originally created as PARQUET-1277. Please see the migration documentation for further details.}