Update outlook-message-parser to 1.7.9

[bbottema]

Going from the current 1.7.5 to 1.7.9 bring the following improvements:

• v1.7.7 - outlook-message-parser/issues/#34 Wrong encoding for bodyHTML
• v1.7.8 - outlook-message-parser/issues/#35 Clarify permission to publish project using Apache v2 license
• v1.7.9 - outlook-message-parser/issues/#28 / outlook-message-parser/issues/#36 bugfix NumberFormatException on parsing .msg files

[bbottema]

Released in 4.7.5