Update version to 1.2.0-rc.2

[dmcgowan]

Prepare for rc.2

[crosbymichael]

LGTM

[codecov-io]

Codecov Report

Merging #2723 into master will decrease coverage by 3.66%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2723      +/-   ##
==========================================
- Coverage   47.34%   43.68%   -3.67%     
==========================================
  Files          92      101       +9     
  Lines        8423    10744    +2321     
==========================================
+ Hits         3988     4693     +705     
- Misses       3711     5320    +1609     
- Partials      724      731       +7

Flag	Coverage Δ
#linux	47.34% <ø> (ø)	⬆️
#windows	40.83% <ø> (?)

Impacted Files	Coverage Δ
snapshots/native/native.go	43.3% <0%> (-10%)	⬇️
metadata/snapshot.go	45.8% <0%> (-8.96%)	⬇️
archive/tar.go	43.13% <0%> (-6.87%)	⬇️
metadata/containers.go	47.97% <0%> (-6.62%)	⬇️
content/local/writer.go	57.84% <0%> (-6.36%)	⬇️
content/local/store.go	48.51% <0%> (-5.03%)	⬇️
remotes/docker/resolver.go	58.36% <0%> (-4.99%)	⬇️
archive/tar_opts.go	28.57% <0%> (-4.77%)	⬇️
archive/compression/compression.go	58.69% <0%> (-4.7%)	⬇️
metadata/images.go	58.46% <0%> (-4.7%)	⬇️
... and 57 more

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