patch 9.1.0317: filetype: matplotlibrc files are not recognized

Problem:  filetype: matplotlibrc files are not recognized
Solution: Detect 'matplotlibrc' file as yaml filetype
          (Wu, Zhenyu)

See: https://matplotlib.org/stable/users/explain/customizing.html#the-matplotlibrc-file

closes: #14501

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 0d48833..8b23724 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    317,
+/**/
     316,
 /**/
     315,