Log Message:
Update obfs4proxy to 0.0.11. Now a Go module build.

Changes in version 0.0.11 - 2019-06-21:
 - Update my e-mail address.
 - Change the obfs4 behavior for handling handshake failure to be more
   uniform.  Thanks to Sergey Frolov for assistance.
 - Bump the version of the utls fork.

Changes in version 0.0.10 - 2019-04-12:
 - Disable behavior distinctive to crypto/tls when using utls.
 - Bump the version of the utls fork.

Changes in version 0.0.9 - 2019-02-05:
 - Various meek_lite code cleanups and bug fixes.
 - Bug 29077: uTLS for ClientHello camouflage (meek_lite).
 - More fixes to HTTP Basic auth.
 - (meek_lite) Pin the certificate chain public keys for the default
   Tor Browser Azure bridge (meek_lite).