Add type parameters in BlockedKeywordValidator#validateComment

Change-Id: I7fa6332e48b077b2c62b61603c620615ea83f317

src/main/java/com/googlesource/gerrit/plugins/uploadvalidator/BlockedKeywordValidator.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/uploadvalidator/BlockedKeywordValidator.java b/src/main/java/com/googlesource/gerrit/plugins/uploadvalidator/BlockedKeywordValidator.java
index 2ce98eb..288afcf 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/uploadvalidator/BlockedKeywordValidator.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/uploadvalidator/BlockedKeywordValidator.java
@@ -221,7 +221,7 @@
   }
 
   private static Optional<CommentValidationFailure> validateComment(
-      ImmutableMap blockedKeywordPatterns, CommentForValidation comment) {
+      ImmutableMap<String, Pattern>  blockedKeywordPatterns, CommentForValidation comment) {
     // Uses HashSet data structure for de-duping found blocked keywords.
     Set<String> findings = new LinkedHashSet<String>(
         findBlockedKeywordsInString(blockedKeywordPatterns.values(), comment.getText()));