Update dependencies (#57)

Author: jimmyjames

lib/build.gradle

@@ -30,11 +30,11 @@ compileJava {
     targetCompatibility '1.7'
 }
 
-ext.springSecurityVersion = '4.2.15.RELEASE'
+ext.springSecurityVersion = '4.2.20.RELEASE'
 
 dependencies {
-    api "com.auth0:java-jwt:3.10.2"
-    api "com.auth0:jwks-rsa:0.11.0"
+    api "com.auth0:java-jwt:3.13.0"
+    api "com.auth0:jwks-rsa:0.15.0"
     api "org.springframework.security:spring-security-core:${springSecurityVersion}"
     api "org.springframework.security:spring-security-web:${springSecurityVersion}"
     api "org.springframework.security:spring-security-config:${springSecurityVersion}"