checkenremote: improve github readme url detection

dot_zsh_functions

@@ -326,6 +326,10 @@ function checkenlist() {
 
 function checkenremote() {
     local target_url=$(echo "$1" | sed 's/github.com/raw.githubusercontent.com/g' | sed 's;blob/;;')
+    if [[ "$target_url" =~ "githubusercontent.com" && ! "$target_url" =~ "README" ]]; then
+        target_url=$(echo "$target_url/master/README.md")
+    fi
+    arrow "checking $target_url"
     curl --location --insecure --silent "$target_url" > /tmp/file && checkenlist /tmp/file && write-good --no-passive /tmp/file && proselint /tmp/file && \cat /tmp/file > alex -q --stdin
 }