[issue-725] Update connector version to 0.13.1-SNAPSHOT

[crazyzhou]

Change log description
Update connector to 0.13.1-SNAPSHOT on r0.13 branch

Purpose of the change
Fix #725

What the code does
Update connectorVersion in gradle.properties
Update compatibility matrix in README.md

How to verify it
./gradlew clean build passed

[anishakj]

LGTM

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (da4c706) 81.12% compared to head (332688c) 81.23%.

Additional details and impacted files

@@             Coverage Diff              @@
##              r0.13     #727      +/-   ##
============================================
+ Coverage     81.12%   81.23%   +0.11%     
- Complexity      573      574       +1     
============================================
  Files            62       62              
  Lines          2723     2723              
  Branches        232      232              
============================================
+ Hits           2209     2212       +3     
+ Misses          326      324       -2     
+ Partials        188      187       -1     

see 1 file with indirect coverage changes

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[fyang86]

LGTM