Links pointing to file with whitespace (%20) is incorrectly parsed (%2520)

[jogerj]

Somewhat related to #39

When a url points to a local file [foo](./sub%20folder/foo.txt) it generates a path of i.e. file:///C:/Users/FooUser/path/to/sub%2520folder/filename.txt. In this case, the % character is parsed into %25 so the whitespace rendered becomes %2520, which naturally does not work