Bug fix: honor blink attributes in ANSI parser

Before this, setting `color.diff.old = blink` broke Delta as follows:

- Git outputs SGR attribute 5 (blink slow)

- Delta at start-up parsed that style string (using Delta's style
  string parsing code) to a style object without the blink flag set

- Subsequently, Delta encountered the ANSI sequences in the raw line from Git
  and parsed them using vte to a style object with the blink flag set

- The two compared unequal, triggering Delta to think that it had seen
  a line that was not a normal minus line. When Delta reaches that
  conclusion, it (per d9a07679df and surrounding commits) outputs the
  raw line with its ANSI sequences intact, rather than creating the
  usual Delta output for that line.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/ansi/parse.rs b/src/ansi/parse.rs
index bd9b899c..60973b94 100644
--- a/src/ansi/parse.rs
+++ b/src/ansi/parse.rs
@@ -66,8 +66,8 @@ fn ansi_term_style_from_sgr_parameters(parameters: &[i64]) -> ansi_term::Style {
             2 => style.is_dimmed = true,
             3 => style.is_italic = true,
             4 => style.is_underline = true,
-            // 5 => Some(Attr::BlinkSlow),
-            // 6 => Some(Attr::BlinkFast),
+            5 => style.is_blink = true, // blink slow
+            6 => style.is_blink = true, // blink fast
             7 => style.is_reverse = true,
             8 => style.is_hidden = true,
             9 => style.is_strikethrough = true,