Enable prefer-const in the eslint config (#166)

JustinBeckwith · alexander-fenster · commit adc40e5e331f · 2018-09-20T12:32:21.000-07:00
diff --git a/handwritten/nodejs-logging-winston/.eslintrc.yml b/handwritten/nodejs-logging-winston/.eslintrc.yml
@@ -12,3 +12,4 @@ rules:
   eqeqeq: error
   no-warning-comments: warn
   no-var: error
+  prefer-const: error
