pylint: split command line argument on multiple lines

This clarify the important line in that configuration.

Differential Revision: https://phab.mercurial-scm.org/D1831

tests/test-check-pylint.t

@@ -1,20 +1,21 b''
 #require test-repo pylint hg10
 
 Run pylint for known rules we care about.
 -----------------------------------------
 
 There should be no recorded failures; fix the codebase before introducing a
 new check.
 
 Current checks:
 - W0102: no mutable default argument
 
   $ touch $TESTTMP/fakerc
   $ pylint --rcfile=$TESTTMP/fakerc --disable=all \
-  >   --enable=W0102 --reports=no \
+  >   --enable=W0102 \
+  >   --reports=no \
   >   --ignore=thirdparty \
   >   mercurial hgdemandimport hgext hgext3rd
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