[bugfix] html escape special characters in text instead of totally removing them (#719)

* remove minify dependency

* tidy up some tests

* remove pre + postformat funcs

* rework sanitization + formatting

* update tests

* add some more markdown tests

vendor/github.com/tdewolff/parse/v2/.golangci.yml

@@ -1,16 +0,0 @@
-linters:
-  enable:
-  - depguard
-  - dogsled
-  - gofmt
-  - goimports
-  - golint
-  - gosec
-  - govet
-  - megacheck
-  - misspell
-  - nakedret
-  - prealloc
-  - unconvert
-  - unparam
-  - wastedassign