Use latest milestone release of ota4j

Author: marcphilipp

gradle.properties

@@ -14,7 +14,7 @@ assertJVersion = 3.6.2
 junit4Version  = 4.12
 log4jVersion   = 2.8.1
 mockitoVersion = 2.7.19
-ota4jVersion   = 1.0.0-SNAPSHOT
+ota4jVersion   = 1.0.0-M2
 degraphVersion = 0.1.4
 
 defaultBuiltBy = JUnit Team