Update github.com/duo-labs/webauthn commit hash to 4e4eb99

This MR contains the following updates:

Package	Type	Update	Change
github.com/duo-labs/webauthn	require	digest	9f1b88e -> 4e4eb99

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vendor/github.com/dgrijalva/jwt-go/.travis.yml

-language: go
-
-script:
-    - go vet ./...
-    - go test -v ./...
-
-go:
-  - 1.3
-  - 1.4
-  - 1.5
-  - 1.6
-  - 1.7
-  - tip