Bump version to 0.2.3

Example/Podfile.lock

 PODS:
-  - GMCache (0.2.1):
+  - GMCache (0.2.2):
     - TMCache (= 2.1.0)
   - TMCache (2.1.0)
 
@@ -15,7 +15,7 @@ EXTERNAL SOURCES:
     :path: "../"
 
 SPEC CHECKSUMS:
-  GMCache: 776334eaa82af7b807c3420e383920d5353e4534
+  GMCache: dce933a21cf44eb834fdbbba537543a2f775e4cc
   TMCache: 95ebcc9b3c7e90fb5fd8fc3036cba3aa781c9bed
 
 PODFILE CHECKSUM: 8d482f956ed77b240df3be8144ac3958c903d882

GMCache.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
     s.name             = "GMCache"
-    s.version          = "0.2.2"
+    s.version          = "0.2.3"
     s.summary          = "缓存"
     s.homepage         = "http://git.wanmeizhensuo.com/gengmeiios/GMCache"
     s.license          = 'MIT'