pandoc/test/command/5177.md

This should not give a "Prelude.read: no parse" error:

```
% pandoc -M foo=1e -s -t markdown
hi
^D
---
foo: 1e
---

hi
```
Simplify/fix reading of `--metadata` values on command line. Previously we used HsYAML's decodeStrict to recognize boolean values (treating everything else as a string). This caused problems relating to hvr/HsYAML#7. We now just check for the recognized boolean values `true\|True\|TRUE\|false\|False\|FALSE`, and avoid using HsYAML. Closes #5177. 2019-01-01 06:20:56 +01:00			`This should not give a "Prelude.read: no parse" error:`

			```
			`% pandoc -M foo=1e -s -t markdown`
			`hi`
			`^D`
			`---`
			`foo: 1e`
			`---`

			`hi`
			```