Update rack-attack to 4.2.0

If we are going to monkey-patch something it might as well be the latest version.

Update rack-attack to 4.2.0
7512016d · Jacob Vosmaer · 19865b7c · 7512016d
Commit 7512016d authored Dec 15, 2014 by Jacob Vosmaer
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Gemfile.lock Gemfile.lock +1 -1

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--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -356,7 +356,7 @@ GEM
    rack (1.5.2)
    rack-accept (0.4.5)
      rack (>= 0.4)
-    rack-attack (2.3.0)
+    rack-attack (4.2.0)
      rack
    rack-cors (0.2.9)
    rack-mini-profiler (0.9.0)