Update eslint rules

src/email/templates.js

@@ -1,11 +1,11 @@
 'use strict';
 
 exports.verifyKey = ({name, baseUrl, keyId, nonce}) => ({
-  subject: `Verify Your Key`,
+  subject: 'Verify Your Key',
   text: `Hello ${name},\n\nplease click here to verify your email address:\n\n${baseUrl}/api/v1/key?op=verify&keyId=${keyId}&nonce=${nonce}`,
 });
 
 exports.verifyRemove = ({name, baseUrl, keyId, nonce}) => ({
-  subject: `Verify Key Removal`,
+  subject: 'Verify Key Removal',
   text: `Hello ${name},\n\nplease click here to verify the removal of your email address:\n\n${baseUrl}/api/v1/key?op=verifyRemove&keyId=${keyId}&nonce=${nonce}`,
 });