Updatede solution path in Travis.yml file as per build error in Travis CI build.
Updatede solution path in Travis.yml file as per build error in Travis CI build.

Like the last commit but instead of nuget restore line change I also
changed the solution line.

Davesmall28/DSmall.DynamicsCrm.Plugins.Core,SpringBoard365/Springboard365.Xrm.Plugins.Core