Upgrade to gradle-git 1.5.1

Author: sbrannen

build.gradle

@@ -9,7 +9,7 @@ buildscript {
 	dependencies {
 		classpath 'com.diffplug.gradle.spotless:spotless:1.3.3'
 		classpath 'org.asciidoctor:asciidoctor-gradle-plugin:1.5.3'
-		classpath 'org.ajoberstar:gradle-git:1.5.0'
+		classpath 'org.ajoberstar:gradle-git:1.5.1'
 		classpath 'org.junit.platform:junit-platform-gradle-plugin:1.0.0-SNAPSHOT'
 		classpath 'net.nemerosa:versioning:2.4.0'
 		classpath 'com.github.ben-manes:gradle-versions-plugin:0.13.0'