nosudo on CentOS and Fetch Changelogs on Amazon, RHEL (#448)

* Use repoquery for no sudo and avoid unintended line feed of yum or rpm. #444

* Change data type of enablerepo in config.toml. string to array

* Fetch yum changelogs at once then grep CVE-IDs

* Fix changelog parse logic and Update Gopkg

models/models.go

@@ -18,4 +18,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 package models
 
 // JSONVersion is JSON Version
-const JSONVersion = "0.3.0"
+const JSONVersion = 2