Fix schemaLocation for urlsets

#69

Thanks to @redjam13 👍

Fix https bug

#54 Fix wrong namespace.

Bug fixes.

• Update phpspec to 4.0.
• Fix https bugs once and for all.
• Update random bits of license, remove personal email and bump year to 2017.
• Remove PHP 5.6 support in Travis.

HTTPS everywhere ... not

#50 - Apparently Google doesn't like https everywhere and has been failing because of it. Bah.

Fix typo

Fix a typo.

Use https everywhere

#43 - Use https everywhere possible.

Small changes

• Removed support for HHVM and added PHP 7.1 to the Travis configuration.

Thanks to @holtkamp for their contributions to this release.

Fixes

#34 - Fixes bug with attributes not being written correctly.
#40 - Change news publication date to use DATE_ATOM.

Thanks to @lushc and @shashikreddy for their contributions to this release.

Fix composer.json minimum PHP version.

Short array syntax was introduced in 5.4, not 5.5

Add PHP version constraint

#38 - Add PHP version constraint.

Fix bug with processing element order

4.4.2

Update processing instructions spec.