Update gatsby-style-guide.md (#19404)

Changes link to Hemingway App from `https://www.hemingwayapp.com/` to `https://hemingwayapp.com/` because `https://www.hemingwayapp.com/` has an invalid SSL certificate and is flagged as a security risk.
gatsbyjs · Nov 10, 2019 · f488d4a · f488d4a
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commit f488d4a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/contributing/gatsby-style-guide.md b/docs/contributing/gatsby-style-guide.md
@@ -385,7 +385,7 @@ For words that have multiple spellings, prefer the US English word over British
 
 ### Use apps that help you edit
 
-Use the [Hemingway App](https://www.hemingwayapp.com/). There’s nothing magical
+Use the [Hemingway App](https://hemingwayapp.com/). There’s nothing magical
 about this tool, but it will automatically detect widely agreed-upon
 style issues: