Merge pull request prometheus#6210 from cstyan/lex-notes

Add a README.md to textparse package about how to update lexers.
jamiefuller96 · Nov 9, 2019 · 8330801 · 8330801
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diff --git a/pkg/textparse/README.md b/pkg/textparse/README.md
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+# Making changes to textparse lexers
+In the rare case that you need to update the textparse lexers, edit promlex.l or openmetricslex.l and then run the following command: 
+`golex -o=promlex.l.go promlex.l`
+
+Note that you need golex installed: 
+`go get -u modernc.org/golex`