Merge pull request #55 from AlexandrouR/version-update

Bump project version to 4.6.4

Author: josh-richardson

gradle.properties

@@ -1,2 +1,2 @@
 group=org.web3j
-version=4.7.0-SNAPSHOT
+version=4.6.4

gradle/spotless/build.gradle

@@ -23,6 +23,7 @@ spotless {
             include '**/src/*/java/**/*.java'
             exclude '**/.gradle/**'
             exclude '**/generated/**'
+            exclude '**/build/install/**'
         }
         removeUnusedImports()
         googleJavaFormat("1.7").aosp()
@@ -36,6 +37,7 @@ spotless {
         target fileTree('.') {
             include '**/*.kt'
             exclude '**/.gradle/**'
+            exclude '**/build/install/**'
         }
         ktlint('0.31.0')
         trimTrailingWhitespace()