Fix regression in HTML handling (telegram). Closes #734

* Revert back to blackfriday v1
* Add testing

vendor/github.com/russross/blackfriday/.travis.yml

@@ -1,18 +1,17 @@
-# Travis CI (http://travis-ci.org/) is a continuous integration service for
-# open source projects. This file configures it to run unit tests for
-# blackfriday.
-
+sudo: false
 language: go
-
 go:
-    - 1.5
-    - 1.6
-    - 1.7
-
+  - "1.9.x"
+  - "1.10.x"
+  - tip
+matrix:
+  fast_finish: true
+  allow_failures:
+    - go: tip
 install:
-    - go get -d -t -v ./...
-    - go build -v ./...
-
+  - # Do nothing. This is needed to prevent default install action "go get -t -v ./..." from happening here (we want it to happen inside script step).
 script:
-    - go test -v ./...
-    - go test -run=^$ -bench=BenchmarkReference -benchmem
+  - go get -t -v ./...
+  - diff -u <(echo -n) <(gofmt -d -s .)
+  - go tool vet .
+  - go test -v -race ./...