Update to Gradle 5.0 (#260)

diff --git a/build.gradle b/build.gradle
index 81b8a62..432907e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -17,7 +17,7 @@
 import net.ltgt.gradle.errorprone.CheckSeverity
 
 plugins {
-  id "com.github.sherter.google-java-format" version "0.7.1"
+  id "com.github.sherter.google-java-format" version "0.8"
   id "net.ltgt.errorprone" version "0.6" apply false
   id "com.github.johnrengelman.shadow" version "2.0.4" apply false
   id 'com.github.kt3k.coveralls' version '2.6.3' apply false
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 01b8bf6..0d4a951 100644
--- a/gradle/wrapper/gradle-wrapper.jar
+++ b/gradle/wrapper/gradle-wrapper.jar
Binary files differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 949819d..75b8c7c 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.0-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip