Parens for clarity around logic precedence

Added parens for clarity around logic precedence.

Author: ericbeland

browserup-proxy-core/src/main/java/com/browserup/bup/util/BrowserUpHttpUtil.java

@@ -135,7 +135,7 @@ public static boolean hasTextualContent(String contentType) {
                 contentType.startsWith("application/json")  ||
                 contentType.startsWith("application/xml")  ||
                 contentType.startsWith("application/xhtml+xml") ||
-                contentType.startsWith("application/") && contentType.endsWith("+json")
+                (contentType.startsWith("application/") && contentType.endsWith("+json"))
                 );
     }