Fix typo in README

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
use

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.

In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.

This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.

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Upgrade to latest SDK and change the way items are fetched

Reduce struct size by 8 bytes on 64-bit build

A void function should not return

Fix exit status propagation on AppVeyor

Fix misspelling

Fix tests for changed constant values

Update versions in the matrix and add PHP 7.2

Fix ZTS mode

This requires shifting str_ member variable out of the Zend globals
(which is stored in TLS), and into a true global structure instead

Add release checklist

Back to dev

Release version 0.1.6

Update changelog

AppVeyor support revamped (#83)

Based on https://github.com/weltling/parle/blob/master/.appveyor.yml

Drop AppVeyor

Not worth it

AppVeyor: Drop phpsdk_deps

The ast extension does not have deps and we do a --disable-all
build, so hopefully this is not necessary.

Mention php-parser-to-php-ast project in README

Moar AppVeyor

Another try at AppVeyor

Fix README TOC link

Add ast\get_supported_versions() function

Closes #77.

Try to fix AppVeyor build

Start testing with php 7.2 in travis (nightly is 7.3-dev)

README: update version 35 to deprecated