Add feature in pull request #18 and upgrade gradle

ReadMe.md

@@ -28,7 +28,7 @@ Add the JitPack repository in your build.gradle at the end of repositories:
 And add the dependency
 ```
 	dependencies {
-	        compile 'com.github.Kunzisoft:Android-SwitchDateTimePicker:1.6'
+	        compile 'com.github.Kunzisoft:Android-SwitchDateTimePicker:1.7'
 	}
 ```