[issue-724] Update connector version to 0.14.0-SNAPSHOT

[crazyzhou]

Change log description
Update connector and Pravega version to 0.14.0-SNAPSHOT, schema registry to 0.7.0-SNAPSHOT

Purpose of the change
Fix #724

What the code does
Update connectorVersion pravegaVersion and schemaRegistryVersion 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 (bddfb70) 81.12%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #726   +/-   ##
=========================================
  Coverage     81.12%   81.12%           
  Complexity      573      573           
=========================================
  Files            62       62           
  Lines          2723     2723           
  Branches        232      232           
=========================================
  Hits           2209     2209           
  Misses          326      326           
  Partials        188      188           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.