Update version to 5.1.1

Author: terrakok

library/build.gradle

@@ -17,7 +17,7 @@ ext {
     bintrayName = 'cicerone'
     publishedGroupId = 'ru.terrakok.cicerone'
     artifact = 'cicerone'
-    libraryVersion = '5.1.0'
+    libraryVersion = '5.1.1'
     gitUrl = 'https://github.com/terrakok/Cicerone'
     allLicenses = ['MIT']
 }