chore(pmd): enable a new rule InsecureCryptoIv from PMD 6.3.0

Quote from https://pmd.github.io/2018/04/29/PMD-6.3.0/#new-rules
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The new Java rule InsecureCryptoIv (java-security) detects hard coded initialization vectors used in
cryptographic operations. It is recommended to use a randomly generated IV.
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Author: php-coder

src/main/config/pmd.xml

@@ -316,4 +316,6 @@
 	<rule ref="category/java/performance.xml/UseStringBufferForStringAppends" />
 	<rule ref="category/java/performance.xml/UseStringBufferLength" />
 
+	<rule ref="category/java/security.xml/InsecureCryptoIv" />
+	
 </ruleset>