Updated gem version to 0.5
Updated gem version to 0.5

Signed-off-by: Akash Manohar J <e4cf979cf717fd295f4e4edc427ee1aee78fa7dc@akash.im>

HashNuke/mailgun,KevinColemanInc/mailgun,KevinColemanInc/mailgun,HashNuke/mailgun,bseth99/mailgun