update PMD compatibility with Gradle 2.0

02-pmd/build.gradle

@@ -14,7 +14,7 @@ test {
 }
 
 pmdMain {
-    ruleSets = [ "basic", "strings" ]
+    ruleSets = [ "java-basic", "java-strings", "java-braces" ]
     ignoreFailures = true
 }
 

README.md

@@ -12,7 +12,7 @@ List all available tasks:
 
 Try to compile source code:
 
-    gradle compile
+    gradle jar
 
 Run tests: