Fix rendered HTML link to php-ast-reverter (#57)

Fix issue #51

Make attribute value for virtual nodes explicit, fix the nullable
case.

Fix ast_dump_with_linenos.phpt test

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Release version 0.1.4

With fix for handling of nullable types

Mark 40 as current version

Drop support for version 20

Fix handling of ?array and ?callable

Wrap these in AST_NULLABLE_TYPE as well.

Add 7.1 to travis

nightly will diverge at some point...

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Release version 0.1.3

Update current version in README

Update display of extension in phpinfo() (#39)

Fix typo in flag list (#37)

Fix PHP 7 build

Update USE_* flags for PHP 7.2

These now use ZEND_SYMBOL_*.

Fix issue #36

The emulation of PHP 7.0 list() structure did not account for
skipped elements.

Mark AST_GREATER(_EQUAL) as obsolete

Drop EXPERIMENTAL file

Followup of ac993fd

Remove "experimental" note

Update stubs

Update current version in README

Remove version 15

Remove version 10

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