Change pgindent/README to specify that we use perltidy version 20170521.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 46cda5bf7bc209554b3c1bbb3040b45735387e0c
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-04-25T17:58:39Z
Releases: 11.0
Change pgindent/README to specify that we use perltidy version 20170521.

Per discussion, this is now the project's standard version.
Update the obsolete URL, and explain how to install a specific version.

Discussion: https://postgr.es/m/CABUevEzK3cNiHZQ18f5tK0guoT+cN_jWeVzhYYxY=r+1Q3SmoA@mail.gmail.com

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src/tools/pgindent/README modified +8 −3

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