(maint) add pom.xml to .gitignore
(maint) add pom.xml to .gitignore

pom.xml is generated during 'lein install'.

camlow325/clj-http-client,puppetlabs/clj-http-client,dmcpl/clj-http-client,scottyw/clj-http-client,rlinehan/clj-http-client,puppetlabs/clj-http-client,dmcpl/clj-http-client,scottyw/clj-http-client,camlow325/clj-http-client,rlinehan/clj-http-client