Version v0.3.6: dicts and list literals, escaping

Version v0.3.5: fixes validate directive, adds skip-if statement

Version v0.3.4: adds line joiner, several bugfixes

Version v0.3.3: implements comparison operators and parenthesis

Version v0.3.2: adds multiplication operators, implements math for serde

Version v0.3.1: validators implemented, as well as some arithmetic an…

Version v0.3.0: allows to test condition on undefined attributes and …

Version v0.2.0: lots of improvements

Version v0.1.1: adds command-line utility