Fix multiline test

[singpolyma]

I think my git settings ate the whitespace, since it was so malformed
intentionally for the test.

[philandstuff]

Hmm, I checked out the branch and got errors running it through cbor2pretty.rb and cbor2yaml.rb:

$ cbor2pretty.rb dhall-lang/tests/parser/success/text/multilineCorruptedLeadingWhitespaceB.dhallb
Traceback (most recent call last):
	4: from /home/philandstuff/.nix-profile/bin/cbor2pretty.rb:18:in `<main>'
	3: from /home/philandstuff/.nix-profile/bin/cbor2pretty.rb:18:in `load'
	2: from /nix/store/agr0i5lj0s3aj5909q9d3r7jwr0xdr7n-cbor-diag-0.5.2/lib/ruby/gems/2.5.0/gems/cbor-diag-0.5.2/bin/cbor2pretty.rb:7:in `<top (required)>'
	1: from /nix/store/jq9mhr5mkmjbhax7rxx313z1172qsl6v-ruby2.5.5-cbor-diag-0.5.2/lib/ruby/gems/2.5.0/gems/cbor-diag-0.5.2/lib/cbor-pretty.rb:17:in `pretty'
/nix/store/jq9mhr5mkmjbhax7rxx313z1172qsl6v-ruby2.5.5-cbor-diag-0.5.2/lib/ruby/gems/2.5.0/gems/cbor-diag-0.5.2/lib/cbor-pretty.rb:79:in `pretty_item_final': unhandled exception

$ cbor2yaml.rb dhall-lang/tests/parser/success/text/multilineCorruptedLeadingWhitespaceB.dhallb
Traceback (most recent call last):
	4: from /home/philandstuff/.nix-profile/bin/cbor2yaml.rb:18:in `<main>'
	3: from /home/philandstuff/.nix-profile/bin/cbor2yaml.rb:18:in `load'
	2: from /nix/store/agr0i5lj0s3aj5909q9d3r7jwr0xdr7n-cbor-diag-0.5.2/lib/ruby/gems/2.5.0/gems/cbor-diag-0.5.2/bin/cbor2yaml.rb:14:in `<top (required)>'
	1: from /nix/store/jq9mhr5mkmjbhax7rxx313z1172qsl6v-ruby2.5.5-cbor-diag-0.5.2/lib/ruby/gems/2.5.0/gems/cbor-diag-0.5.2/lib/cbor-pure.rb:78:in `decode'
/nix/store/jq9mhr5mkmjbhax7rxx313z1172qsl6v-ruby2.5.5-cbor-diag-0.5.2/lib/ruby/gems/2.5.0/gems/cbor-diag-0.5.2/lib/cbor-pure.rb:300:in `decode_item_final': extra bytes follow after a deserialized object of 20 bytes (RuntimeError)

I think there's a trailing byte 0a (newline) which should be removed.

I have tested it and it didn't work for me

[philandstuff]

I pushed a commit which fixed the CBOR