remove the spongycastle dependency

Author: Federico2014

build.gradle

@@ -76,8 +76,6 @@ dependencies {
     compile group: 'io.grpc', name: 'grpc-stub', version: '1.9.0'
 
     compile group: 'com.googlecode.protobuf-java-format', name: 'protobuf-java-format', version: '1.4'
-//    compile "com.madgag.spongycastle:core:1.58.0.0"
-//    compile "com.madgag.spongycastle:prov:1.58.0.0"
     compile group: 'org.bouncycastle', name: 'bcprov-jdk15on', version: '1.68'
     compile group: 'com.typesafe', name: 'config', version: '1.3.2'
     compile "com.google.code.findbugs:jsr305:3.0.0"