Rename ConvertFrom-Markdown #99
Description
ConvertFrom-Markdown was added as a standard command in PowerShellCore 6.
Given that, this module's command should be renamed in order to avoid any conflicts when used in that environment.
Current proposal is to rename it to ConvertFrom-GitHubMarkdown -- adding GitHub in there is more consistent with the rest of the module commands. The only downside to this name is that it might imply that it's specifically about converting GitHub Flavored Markdown whereas it converts both "standard" and "GitHub flavored"