Fix coveralls badge not updating

[BruceHaley]

Following the advice posted here: lemurheavy/coveralls-public#971
Append " &service=github " to the first URL for the badge.

[coveralls]

Pull Request Test Coverage Report for Build 63580

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 71.162%

---

Totals
Change from base Build 63561:	0.0%
Covered Lines:	4348
Relevant Lines:	6110

---

💛 - Coveralls

[fuselabs]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.Luis.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.QnA.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.ApplicationInsights.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Azure.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Dialogs.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.TemplateManager.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Configuration.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Connector.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Schema.dll

[tomlm]