Prepare 1.2.0 release

prep 1.2.0 release

Merge pull request #162 from Cutlery-Drawer/hoist-source

Remove spurious background from `.meta.separator`

Fix priority of `.source` ruleset

Merge pull request #156 from Cutlery-Drawer/colour-improvements

Improve highlighting of errors and invalid whitespace

Colour Pod entity references as character escapes

Add error highlighting to illegal whitespace in Pod

Add syntax-colouring tweaks for Perl and Pod files

Tweak colour applied to multiline unquoted strings

Add highlighting to unquoted/misc string patterns

Prepare 1.1.3 release

update CHANGELOG

Merge pull request #146 from itsnotvalid/itsnotvalid-patch-1