Add disclaimer in master about going to go-three

11 jobs from 104-typo-on-the-about-page in 54 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #7319
Go-py2.7

00:00:50

failed #7321
Go-py3.4

00:00:53

failed #7320
Go-py3.5

00:00:53

failed #6626
Go-py2.7

00:00:34

failed #6630
Go-py2.7

00:00:32

failed #6627
Go-py3.4

00:00:34

failed #6633
Go-py3.4

00:00:36

failed #6631
Go-py3.5

00:00:31

failed #6632
Go-py3.5

00:00:30

failed #6628
Go-py3.5

00:00:30

 
  Lint
skipped #6629
Go-flake8
 
Name Stage Failure
failed
Go-py3.4 Test
Reading package lists...
Building dependency tree...
Reading state information...
Package libmysqlclient-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libmysqlclient-dev' has no installation candidate
ERROR: Job failed: exit code 1
failed
Go-py3.5 Test
Reading package lists...
Building dependency tree...
Reading state information...
Package libmysqlclient-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libmysqlclient-dev' has no installation candidate
ERROR: Job failed: exit code 1
failed
Go-py2.7 Test
Reading package lists...
Building dependency tree...
Reading state information...
Package libmysqlclient-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libmysqlclient-dev' has no installation candidate
ERROR: Job failed: exit code 1