Correctly exclude evaled code

* The previous regexp was ment to only match `(eval)` literally.

Changelog.md

@@ -1,3 +1,7 @@
+# v0.8.7 2015-10-30
+
+* Fix blackliting regexp to correctly match the String `(eval)` absolutely.
+
 # v0.8.6. 2015-10-27
 
 * Add mutation from `Date.parse` to more strict parsing methods #448

lib/mutant/matcher/method.rb

@@ -7,7 +7,7 @@ module Mutant
 
       # Methods within rbx kernel directory are precompiled and their source
       # cannot be accessed via reading source location. Same for methods created by eval.
-      BLACKLIST = %r{\Akernel/|(eval)}.freeze
+      BLACKLIST = %r{\A(kernel/|\(eval\)\z)}.freeze
 
       # Enumerate matches
       #