add shebang support (d5#274)

* add shebang support

fix stdlib json string encoding (d5#272)

fix typo in objects doc (d5#256)

fix markdownlint warnings (d5#255)

builtin delete for maps and arrays (d5#250)

* added builtin delete function and unit tests

* added vm tests for builtin delete

* added doc for builtin delete

* update doc

updated goreleaser config (d5#249)

update vm to raise wrapped runtime errors (d5#247)

* update vm to raise wrapped runtime errors

special errors returned from custom builtin modules can be identified easily by wrapping and using errors package's Is() and As() method.

* added test for runtime errors