Allow CI to modify go.mod and go.sum for missing hashes. (#297)

* Allow CI to modify go.mod and go.sum for missing hashes.
* Updating CHANGELOG.

.travis.yml

@@ -8,8 +8,11 @@ before_install:
 script:
         - go get -t ./...
         - go get -u golang.org/x/lint/golint
-        - go test ./...
-        - CGO_ENABLED=1 go test -race ./...
+        # Temporarily set -mod=mod to allow modification of go.mod and go.sum.
+        # This seems to be caused by a sum missing in the tcell dependency and
+        # should be removed when no longer needed.
+        - go test -mod=mod ./...
+        - CGO_ENABLED=1 go test -mod=mod -race ./...
         - go vet ./...
         - diff -u <(echo -n) <(gofmt -d -s .)
         - diff -u <(echo -n) <(./internal/scripts/autogen_licences.sh .)

CHANGELOG.md

@@ -9,8 +9,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
-- Bump github.com/gdamore/tcell/v2 from 2.0.0 to 2.1.0.
+- Bump github.com/gdamore/tcell/v2 from 2.0.0 to 2.2.0.
 - Bump github.com/mattn/go-runewidth from 0.0.9 to 0.0.10.
+- Allowing CI to modify go.mod and go.sum when necessary.
 
 ### Added