Allow .so minor version numbers above 9 in .gitignore.

Needed now that libpq.so's minor version has reached 10.

.gitignore

@@ -4,9 +4,11 @@
 *.so
 *.so.[0-9]
 *.so.[0-9].[0-9]
+*.so.[0-9].[0-9][0-9]
 *.sl
 *.sl.[0-9]
 *.sl.[0-9].[0-9]
+*.sl.[0-9].[0-9][0-9]
 *.dylib
 *.dll
 *.exp