Add Pep8 Assembly language (#2070)

Pep/8 is a toy assembly language used in some universities for teaching
the basics of assembly and low-level programming.

Signed-off-by: Lucas Bajolet <lucas.bajolet@gmail.com>

lib/linguist/languages.yml

@@ -3160,6 +3160,14 @@ Pascal:
   codemirror_mode: pascal
   codemirror_mime_type: text/x-pascal
   language_id: 281
+Pep8:
+  type: programming
+  color: "#C76F5B"
+  extensions:
+  - ".pep"
+  ace_mode: text
+  tm_scope: source.pep8
+  language_id: 840372442
 Perl:
   type: programming
   tm_scope: source.perl