Update ruby parser for Ruby v2.7.2
This eliminates the warning:
warning: parser/current is loading parser/ruby27, which recognizes
warning: 2.7.1-compliant syntax, but you are running 2.7.2.
Edited by Stan Hu
This eliminates the warning:
warning: parser/current is loading parser/ruby27, which recognizes
warning: 2.7.1-compliant syntax, but you are running 2.7.2.