v0.7.0

Changelog

• 6dae692 #4 added MailerOpts to mail.go
• 4e002ee #4 added tests for MailerOpts
• 6010ac1 #4 updated README
• 74f2fdf #5 renamed Message.FromText to FromString
• 477a1c4 #5 updated README
• 6dde704 #5 updated tests
• 85052d3 #7 added docblock