.gitattributes: add *.pl extension for Perl

Change the list of Perl extensions added in 00ddc9d ("Fix build
with core.autocrlf=true", 2017-05-09) to also include *.pl, we have
some of those in the tree, e.g. in t/.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

.gitattributes

@@ -2,6 +2,7 @@
 *.[ch] whitespace=indent,trail,space diff=cpp
 *.sh whitespace=indent,trail,space eol=lf
 *.perl eol=lf
+*.pl eof=lf
 *.pm eol=lf
 /Documentation/git-*.txt eol=lf
 /command-list.txt eol=lf