update go dependencies (lib/pq)

README.md

@@ -143,19 +143,10 @@ For best performance use [HyperLevelDB][libhyperleveldb] as an in-place replacem
 Imposm3 uses the following libraries. `go get` will fetch these:
 
 - <https://github.com/jmhodges/levigo>
-- <https://github.com/mattn/go-sqlite3>
 - <https://code.google.com/p/goprotobuf/proto>
 - <https://code.google.com/p/goprotobuf/protoc-gen-go>
 - <https://github.com/lib/pq>
 
-For now you need to upgrade lib/pq to the bulk branch:
-
-    cd $GOPATH/src/github.com/lib/pq
-    git remote add olt https://github.com/olt/libpq.git
-    git fetch olt
-    git checkout olt/bulk
-
-
 #### Other
 
 Fetching Imposm and the Go libraries requires [mercurial][] and [git][].