Add test for CL

testdata/ColemanLiau/.vale.ini

@@ -0,0 +1,6 @@
+StylesPath = ../../
+
+MinAlertLevel = suggestion
+
+[*.md]
+Readability.ColemanLiau = YES

testdata/ColemanLiau/test.md

@@ -0,0 +1,15 @@
+# Example
+
+The Flesch Reading Ease gives a text a score between 1 and 100, with 100 being
+the highest readability score. Scoring between 70 to 80 is equivalent to school
+grade level 8. This means text should be fairly easy for the average adult to
+read.
+
+The formula was developed in the 1940s by Rudolf Flesch. He was a consultant
+with the Associated Press, developing methods for improving the readability of
+newspapers.
+
+Now, over 70 years later, the Flesch Reading Ease is used by marketers,
+research communicators and policy writers, amongst many others. All use it to
+help them assess the ease by which a piece of text will be understood and
+engaged with.

testdata/test.ct

@@ -1,3 +1,7 @@
 $ cdf ${ROOTDIR}/LIX
 $ vale --output=line --sort --normalize --relative test.md
-test.md:1:1:Readability.LIX:Try to keep the LIX score (38.27) below 35.
+test.md:1:1:Readability.LIX:Try to keep the LIX score (38.27) below 35.
+
+$ cdf ${ROOTDIR}/ColemanLiau
+$ vale --output=line --sort --normalize --relative test.md
+test.md:1:1:Readability.ColemanLiau:Try to keep the Coleman–Liau Index grade (9.58) below 9.