README.md: add links to functions

Author: ttaylorr

README.md

@@ -24,8 +24,13 @@ func main() {
 }
 ```
 
-You can then open objects for inspection with the `Blob()`, `Commit()`,
-`Tag()`, or `Tree()` functions:
+You can then open objects for inspection with the [`Blob()`][blob],
+[`Commit()`][commit], [`Tag()`][tag], or [`Tree()`][tree] functions:
+
+[blob]: https://godoc.org/github.com/git-lfs/gitobj#ObjectDatabase.Blob
+[commit]: https://godoc.org/github.com/git-lfs/gitobj#ObjectDatabase.Commit
+[tag]: https://godoc.org/github.com/git-lfs/gitobj#ObjectDatabase.Tag
+[tree]: https://godoc.org/github.com/git-lfs/gitobj#ObjectDatabase.Tree
 
 ```go
 func main() {
@@ -43,8 +48,13 @@ func main() {
 ```
 
 Once an object is opened or an instance is held, it can be saved to the object
-database using the `WriteBlob()`, `WriteCommit()`, `WriteTag()`, or
-`WriteTree()` functions:
+database using the [`WriteBlob()`][wblob], [`WriteCommit()`][wcommit],
+[`WriteTag()`][wtag], or [`WriteTree()`][wtree] functions:
+
+[wblob]: https://godoc.org/github.com/git-lfs/gitobj#ObjectDatabase.WriteBlob
+[wcommit]: https://godoc.org/github.com/git-lfs/gitobj#ObjectDatabase.WriteCommit
+[wtag]: https://godoc.org/github.com/git-lfs/gitobj#ObjectDatabase.WriteTag
+[wtree]: https://godoc.org/github.com/git-lfs/gitobj#ObjectDatabase.WriteTree
 
 ```go
 func main() {