Bring back files from vendor directory that we accidentally excluded

vendor/dario.cat/mergo/.deepsource.toml

@@ -0,0 +1,12 @@
+version = 1
+
+test_patterns = [
+  "*_test.go"
+]
+
+[[analyzers]]
+name = "go"
+enabled = true
+
+  [analyzers.meta]
+  import_path = "dario.cat/mergo"

vendor/dario.cat/mergo/.travis.yml

@@ -0,0 +1,12 @@
+language: go
+arch:
+    - amd64
+    - ppc64le
+install:
+  - go get -t
+  - go get golang.org/x/tools/cmd/cover
+  - go get github.com/mattn/goveralls
+script:
+  - go test -race -v ./...
+after_script:
+  - $HOME/gopath/bin/goveralls -service=travis-ci -repotoken $COVERALLS_TOKEN