Fix border-bottom for Gist line numbers

Author: mmistakes

CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 - New installation and upgrade instructions.
 
+### Fixed
+- Fix `border-bottom` for Gist line numbers.
+
 ## [1.2.0] - 2018-01-05
 
 ### Added

_sass/basically-basic/_syntax-highlighting.scss

@@ -312,3 +312,9 @@ figure.highlight {
     color: $base09;
   }
 }
+
+.gist {
+  th, td {
+    border-bottom: 0;
+  }
+}