Frozen string literals

[TonyCTHsu]

2.0 Upgrade Guide notes

🚨 In 2.0, all the strings are frozen. Make sure your code does not mutate them.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (5cb48c5) 98.13% compared to head (4458dde) 98.13%.
Report is 26 commits behind head on 2.0.

Files	Patch %	Lines
lib/datadog/tracing/span_operation.rb	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              2.0    #3392   +/-   ##
=======================================
  Coverage   98.13%   98.13%           
=======================================
  Files        1249     1249           
  Lines       72086    72079    -7     
  Branches     3372     3372           
=======================================
- Hits        70741    70736    -5     
+ Misses       1345     1343    -2     

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