include libssl-dev for travis-ci.

.travis.yml

@@ -1,6 +1,12 @@
 language: go
 sudo: required
 dist: trusty
+
+addons:
+  apt:
+    packages:
+      - libssl-dev
+
 env:
   - GOTAGS=
   - GOTAGS=libsqlite3
@@ -12,8 +18,8 @@ go:
   - 1.9.x
   - master
 before_install:
-  # - go get github.com/mattn/goveralls
+  - go get github.com/mattn/goveralls
   - go get golang.org/x/tools/cmd/cover
 script:
-  # - $HOME/gopath/bin/goveralls -repotoken 3qJVUE0iQwqnCbmNcDsjYu1nh4J4KIFXx
+  - $HOME/gopath/bin/goveralls -repotoken PfqH9iFyzW3daUxflzllSougjTxvFwQZE
   - go test -race -v . -tags "$GOTAGS"