Validate email in request

[markCwatson]

Right now, the request validation does not check if the email is a standard email format. We are using express-json-validator-middleware v3.0.1, but when I add "format": "email" to the email properties in the schema, I see the following error. This appears to be supported in older versions (ex. v2.2.1).

Error: unknown format "email" ignored in schema at path "#/properties/email"
at unknownFormat (/app/node_modules/express-json-validator-middleware/node_modules/ajv/dist/vocabularies/format/format.js:63:23)
at validateFormat (/app/node_modules/express-json-validator-middleware/node_modules/ajv/dist/vocabularies/format/format.js:50:17)
at Object.code (/app/node_modules/express-json-validator-middleware/node_modules/ajv/dist/vocabularies/format/format.js:22:13)
at keywordCode (/app/node_modules/express-json-validator-middleware/node_modules/ajv/dist/compile/validate/index.js:464:13)
at /app/node_modules/express-json-validator-middleware/node_modules/ajv/dist/compile/validate/index.js:222:17
at CodeGen.code (/app/node_modules/express-json-validator-middleware/node_modules/ajv/dist/compile/codegen/index.js:439:13)
at CodeGen.block (/app/node_modules/express-json-validator-middleware/node_modules/ajv/dist/compile/codegen/index.js:568:18)
at iterateKeywords (/app/node_modules/express-json-validator-middleware/node_modules/ajv/dist/compile/validate/index.js:219:9)
at groupKeywords (/app/node_modules/express-json-validator-middleware/node_modules/ajv/dist/compile/validate/index.js:200:13)
at /app/node_modules/express-json-validator-middleware/node_modules/ajv/dist/compile/validate/index.js:192:13
Closing database connection...