Bump cheshire, it *should* support earlier javas now

Author: dakrone

.travis.yml

@@ -5,4 +5,6 @@ branches:
   only:
     - master
 jdk:
+  - openjdk7
+  - oraclejdk7
   - oraclejdk8

project.clj

@@ -15,7 +15,7 @@
                  [slingshot "0.12.2"]
                  [potemkin "0.4.3"]]
   :profiles {:dev {:dependencies [;; optional deps
-                                  [cheshire "5.6.0"]
+                                  [cheshire "5.6.1"]
                                   [crouton "0.1.2"]
                                   [org.clojure/tools.reader "0.10.0"]
                                   [com.cognitect/transit-clj "0.8.285"]