Fix invisible file path text in PowerShell (#557)

change default path color on Windows

This avoids a conflict with a PowerShell configuration that causes text to be invisible.

Fixes #342

src/args.rs

@@ -692,7 +692,10 @@ impl<'a> ArgMatches<'a> {
     fn color_specs(&self) -> Result<ColorSpecs> {
         // Start with a default set of color specs.
         let mut specs = vec![
+            #[cfg(unix)]
             "path:fg:magenta".parse().unwrap(),
+            #[cfg(windows)]
+            "path:fg:cyan".parse().unwrap(),
             "line:fg:green".parse().unwrap(),
             "match:fg:red".parse().unwrap(),
             "match:style:bold".parse().unwrap(),

src/printer.rs

@@ -576,7 +576,7 @@ pub struct ColorSpecs {
 /// Valid colors are `black`, `blue`, `green`, `red`, `cyan`, `magenta`,
 /// `yellow`, `white`.
 ///
-/// Valid style instructions are `nobold` and `bold`.
+/// Valid style instructions are `nobold`, `bold`, `intense`, `nointense`.
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct Spec {
     ty: OutType,