Update to 2.0134

Upstream changes:
2.0134  2019-02-10
    - Fix overzealous POD escaping in the docs' synposes
        - https://github.com/shlomif/perl-XML-LibXML/issues/26
        - Thanks to @davorg.

2.0133  2019-02-02
    - Mark as working with libxml2 2.9.9 ( and below ).
    - Allow LibParser to be provided for all methods
        - https://github.com/shlomif/perl-XML-LibXML/pull/23
        - Thanks to @lavock .
    - Portability fixes by Reini Urban and others.
        - https://github.com/shlomif/perl-XML-LibXML/pull/18 .
        - Thanks!

(wen)