Update rexml to v3.2.8 in Gemfile.lock

Author: eby-dev

Gemfile.lock

@@ -211,7 +211,7 @@ GEM
       claide (>= 1.0.2, < 2.0)
       colored2 (~> 3.1)
       nanaimo (~> 0.3.0)
-      rexml (~> 3.2.4)
+      rexml (~> 3.2.8)
     xcpretty (0.3.0)
       rouge (~> 2.0.7)
     xcpretty-travis-formatter (1.0.1)