Update boomerang to newest version.

[mc-chaos]

Update boomerang to newest version, to get version update Form Dezember 2019. there are many performance and size updates. See Update 12.2019

• Reduced the overhead and increased the compatibility of the Loader Snippet

• Reduced the CPU cost of gathering ResourceTiming data

• Reduced the size of Boomerang by stripping debug messages, applying smarter minification, and enabling Brotli

• Reduced the size of and overhead of cookies for Session tracking

• Reduced the size of Boomerang and complexity of hashing URLs by switching to FNV

• Created a Performance Test Suite to track our improvements over time