fix: remove deprecated tag that was added prematurely

[kamalaboulhosn]

Fixes #58

[codecov]

Codecov Report

Merging #97 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #97      +/-   ##
============================================
- Coverage     79.94%   79.90%   -0.04%     
  Complexity      305      305              
============================================
  Files            21       21              
  Lines          2603     2603              
  Branches        129      129              
============================================
- Hits           2081     2080       -1     
  Misses          467      467              
- Partials         55       56       +1     

Impacted Files	Coverage Δ	Complexity Δ
.../com/google/cloud/pubsub/v1/MessageDispatcher.java	85.14% <0.00%> (-0.50%)	25.00% <0.00%> (ø%)
...in/java/com/google/cloud/pubsub/v1/Subscriber.java	80.00% <0.00%> (ø)	22.00% <0.00%> (ø%)	⬆️

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[hannahrogers-google]

LGTM. Can you just run 'mvn clean verify' before submitting to correct the formatting?