feat: expose updateTime field of the bucket

[athakor]

Fixes #448

[codecov]

Codecov Report

Merging #449 into master will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #449      +/-   ##
============================================
+ Coverage     63.12%   63.19%   +0.07%     
- Complexity      610      622      +12     
============================================
  Files            32       32              
  Lines          5133     5144      +11     
  Branches        490      491       +1     
============================================
+ Hits           3240     3251      +11     
  Misses         1729     1729              
  Partials        164      164              

Impacted Files	Coverage Δ	Complexity Δ
...src/main/java/com/google/cloud/storage/Bucket.java	82.20% <100.00%> (+0.12%)	34.00 <0.00> (ø)
...main/java/com/google/cloud/storage/BucketInfo.java	82.01% <100.00%> (+0.27%)	86.00 <1.00> (+3.00)

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[dmitry-fa]

Looks good!