doc(examples): remove outdated troubleshooting

All hail go modules. Go path issues like this are no longer an issue.

examples/README.md

@@ -21,21 +21,3 @@ Let us know if you find any issue or if you want to contribute and add a new tut
 - [A chapter based approach to building a libp2p application](./ipfs-camp-2019/) _Created for [IPFS Camp 2019](https://github.com/ipfs/camp/tree/master/CORE_AND_ELECTIVE_COURSES/CORE_COURSE_B)_
 
 For js-libp2p examples, check https://github.com/libp2p/js-libp2p/tree/master/examples
-
-## Troubleshooting
-
-When building the examples ensure you have a clean `$GOPATH`. If you have checked out and built other `libp2p` repos then you may get errors similar to the one below when building the examples. Note that the use of the `gx` package manager **is not required** to run the examples or to use `libp2p`.
-```
-$:~/go/src/github.com/libp2p/go-libp2p-examples/libp2p-host$ go build host.go
-# command-line-arguments
-./host.go:36:18: cannot use priv (type "github.com/libp2p/go-libp2p-crypto".PrivKey) as type "gx/ipfs/QmNiJiXwWE3kRhZrC5ej3kSjWHm337pYfhjLGSCDNKJP2s/go-libp2p-crypto".PrivKey in argument to libp2p.Identity:
-        "github.com/libp2p/go-libp2p-crypto".PrivKey does not implement "gx/ipfs/QmNiJiXwWE3kRhZrC5ej3kSjWHm337pYfhjLGSCDNKJP2s/go-libp2p-crypto".PrivKey (wrong type for Equals method)
-                have Equals("github.com/libp2p/go-libp2p-crypto".Key) bool
-                want Equals("gx/ipfs/QmNiJiXwWE3kRhZrC5ej3kSjWHm337pYfhjLGSCDNKJP2s/go-libp2p-crypto".Key) bool
-```
-
-To obtain a clean `$GOPATH` execute the following:
-```
-> mkdir /tmp/libp2p-examples
-> export GOPATH=/tmp/libp2p/examples
-```