Update carrier fees

[kathryncc]

Changes occurring Sept 1st:

Short Code SMS
Carrier, SMS MT (new), SMS MO (new)
Cogeco, $0.0035, -
Fastwyre, $0.0035, $0.0035
Optimera ,0.004, -

10DLC SMS
Carrier ,SMS MT (increase), SMS MT (no change), SMS MO (new)
1stPoint/FirstPoint, $0.004, -, $0.004
DISH Wireless, -, $0.0035, $0.0035

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• Documentation Update & Changes
• REST API Update
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[hey-august]

Looks good!