php-ast 1.1.0dev: Deprecate AST versions 50 and 60, drop support for php < 7.2 (#185)

* Deprecate AST versions 50 and 60

AST version 70 has been supported since php-ast 1.0.1 (2019-

php-ast 1.1.0dev: Deprecate AST versions 50 and 60, drop support for php < 7.2 (#185)

* Deprecate AST versions 50 and 60

AST version 70 has been supported since php-ast 1.0.1 (2019-02-11).

Related to #114

* Drop support for php <= 7.1

Update documentation to mention this.

* Update test expectation for AST version 60 deprecation

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Drop support for version 45

Remove version 40

Deprecate AST version 40

In version 50+, return an empty statement list in \ast\parse_file

This makes \ast\parse_file and \ast\parse_code consistent.

file_get_contents has a similar check of the result of s

In version 50+, return an empty statement list in \ast\parse_file

This makes \ast\parse_file and \ast\parse_code consistent.

file_get_contents has a similar check of the result of stream_read,
it will return the empty string if it returned null.

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