svn ignore update for idea

git-svn-id: https://svn.apache.org/repos/asf/geronimo/javamail/trunk@1864121 13f79535-47bb-0310-9956-ffa450edef68
tree: 3103ec3cbbf9819d137ce8f62297513259a2dfbf
  1. geronimo-javamail_1.3.1/
  2. geronimo-javamail_1.4/
  3. geronimo-javamail_1.5/