Test Go 1.14
Test Go 1.14

Golang 1.14 was released in February - update `.travis.yml` to test it.

Change-Id: I56b7c7a378e82f2b0a2b2ea579be4dea14b229f9
Signed-off-by: Chris Diamand <1f58517798882095082bdee11eba81705511491e@arm.com>

ARM-software/bob-build,ARM-software/bob-build,ARM-software/bob-build,ARM-software/bob-build,ARM-software/bob-build