remove uses of deprecated JUnit methods

[mattnworb]

No description provided.

[codecov]

Codecov Report

Merging #44 into master will increase coverage by 2.15%.
The diff coverage is 81.81%.

@@             Coverage Diff              @@
##             master      #44      +/-   ##
============================================
+ Coverage     65.80%   67.95%   +2.15%     
- Complexity      176      188      +12     
============================================
  Files            30       32       +2     
  Lines           731      752      +21     
  Branches         29       29              
============================================
+ Hits            481      511      +30     
+ Misses          229      220       -9     
  Partials         21       21              

Impacted Files	Coverage Δ	Complexity Δ
...va/com/spotify/github/v3/prs/ReviewParameters.java	100.00% <ø> (+100.00%)	1.00 <0.00> (+1.00)
...m/spotify/github/v3/clients/PullRequestClient.java	26.41% <63.63%> (+26.41%)	5.00 <2.00> (+5.00)
...va/com/spotify/github/v3/clients/GitHubClient.java	72.72% <100.00%> (+3.57%)	45.00 <4.00> (+4.00)
...spotify/github/v3/prs/RequestReviewParameters.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
.../java/com/spotify/github/v3/prs/ReviewComment.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)

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