#150 add String.isNullOrBlank and String.isNotNullOrBlank

[komape]

No description provided.

[codecov]

Codecov Report

Merging #151 (430cb04) into master (4d3102f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #151   +/-   ##
=======================================
  Coverage   97.77%   97.77%           
=======================================
  Files          12       12           
  Lines         763      765    +2     
=======================================
+ Hits          746      748    +2     
  Misses         17       17           

Impacted Files	Coverage Δ
lib/src/string.dart	100.00% <100.00%> (ø)

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[passsy]

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