Use HTTPS instead of HTTP to resolve dependencies

This fixes a security vulnerability in this project where the `pom.xml`
files were configuring Maven to resolve dependencies over HTTP instead of
HTTPS.

Signed-off-by: Jonathan Leitschuh <[email protected]>

Author: JLLeitschuh

pom.xml

@@ -245,15 +245,15 @@
       </snapshots>
       <id>bintray</id>
       <name>bintray</name>
-      <url>http://jcenter.bintray.com</url>
+      <url>https://jcenter.bintray.com</url>
     </repository>
     <repository>
       <snapshots>
         <enabled>false</enabled>
       </snapshots>
       <id>central</id>
       <name>central</name>
-      <url>http://repo1.maven.org</url>
+      <url>https://repo1.maven.org</url>
     </repository>
   </repositories>
 
@@ -272,7 +272,7 @@
       </snapshots>
       <id>central</id>
       <name>bintray-plugins</name>
-      <url>http://jcenter.bintray.com</url>
+      <url>https://jcenter.bintray.com</url>
     </pluginRepository>
   </pluginRepositories>