propose: add `- |-` gramma support

[leslie-tsang]

Currently, lua-tinyyaml don't support - |- gramma, which will throw a found bad indenting in line error, which is common supported in most yaml parsers.

test case

yaml_key:
  - "test"
  - |-
    aa
    bb
    cc

[kayx23]

Hi @leslie-tsang , there has been an interest on this topic today (@nfrankel). Wondering if somebody knowledgeable enough about how things work here can help review the PR proposed. It's a teeny tiny change. Thanks in advance.

[leslie-tsang]

Hi @leslie-tsang , there has been an interest on this topic today (@nfrankel). Wondering if somebody knowledgeable enough about how things work here can help review the PR proposed. It's a teeny tiny change. Thanks in advance.

I will check it out. :)

[lostk1ng]

@leslie-tsang Any progress on this issue? we use yaml config_provider as backup provider, and ssl certs will use - |- format.