Prepare releasing 1.6.1

[chanseokoh]

It doesn't matter when we merge this, as long as we make a cut after this. (The actual cut we build against is determined at the time of tagging the repo.)

[codecov]

Codecov Report

Merging #3003 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3003      +/-   ##
============================================
- Coverage     69.19%   69.16%   -0.04%     
- Complexity     2658     2659       +1     
============================================
  Files           358      358              
  Lines         12514    12514              
  Branches       1477     1477              
============================================
- Hits           8659     8655       -4     
- Misses         3244     3249       +5     
+ Partials        611      610       -1

Impacted Files	Coverage Δ	Complexity Δ
...aflow/ui/handler/ModifyDataflowVersionHandler.java	0% <0%> (-20.84%)	0% <0%> (-2%)
...ipse/dataflow/core/project/DataflowMavenModel.java	50.61% <0%> (-7.41%)	9% <0%> (ø)
...ow/ui/preferences/RunOptionsDefaultsComponent.java	76.75% <0%> (-0.74%)	45% <0%> (-1%)
...calAppEngineServerLaunchConfigurationDelegate.java	63.43% <0%> (+0.31%)	39% <0%> (ø)	⬇️
.../tools/eclipse/test/util/project/ProjectUtils.java	68.92% <0%> (+1.69%)	40% <0%> (+1%)	⬆️
.../appengine/standard/java8/AppEngineWebBuilder.java	78% <0%> (+4%)	11% <0%> (+1%)	⬆️
...ibraries/LibraryClasspathContainerResolverJob.java	100% <0%> (+25%)	4% <0%> (+1%)	⬆️

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