Bump version to 1.3.1-1 to correct JUnit 5.3.1 issue

Author: joshka

build.gradle

@@ -8,7 +8,7 @@ apply plugin: 'maven-publish'
 apply plugin: 'signing'
 
 group = 'net.joshka'
-version = '1.3.1'
+version = '1.3.1-1'
 ext.isReleaseVersion = !version.endsWith("SNAPSHOT")
 ext.isRunningOnTravis = System.getenv("CI") == "true"