Added a reminder for the jobs mailing list

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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403582

TODO

 
 1.3 release checklist:
+ * Create jobs@libsdl.org
  * Add higher precision timers for profiling
  * Implement YUV texture support
    - in progress, software support is done, Ryan is working on OpenGL shaders