fix: rename shift() to timeShift() function

[bednar]

Closes #235

Proposed Changes

The Flux shift() function was renamed to timeShift() - influxdata/flux#1058

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• mvn test completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #236 (6307d03) into master (e2adb62) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #236   +/-   ##
=========================================
  Coverage     89.27%   89.27%           
  Complexity      442      442           
=========================================
  Files           143      143           
  Lines          5713     5713           
  Branches        270      270           
=========================================
  Hits           5100     5100           
  Misses          534      534           
  Partials         79       79           

Impacted Files	Coverage Δ
...dsl/src/main/java/com/influxdb/query/dsl/Flux.java	96.12% <100.00%> (ø)
...om/influxdb/query/dsl/functions/TimeShiftFlux.java	100.00% <100.00%> (ø)

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[bertrandp]

I need this guys ! thanks