chore: upgrade Gradle project to use 1.0 of the plugin-publish plugin

provider/gradle/build.gradle

@@ -1,15 +1,19 @@
 plugins {
-  id "com.gradle.plugin-publish" version "0.11.0"
+  id "com.gradle.plugin-publish" version "1.0.0"
 }
 
 dependencies {
-  compile project(":provider")
-  compile gradleApi()
+  implementation project(":provider")
+  implementation gradleApi()
+  implementation localGroovy()
   implementation 'com.github.ajalt:mordant:1.2.1'
+  implementation 'commons-io:commons-io:2.11.0'
+  implementation "org.apache.commons:commons-lang3:${project.commonsLang3Version}"
 
-  testCompile 'org.mockito:mockito-core:2.28.2'
-  testRuntime "org.junit.vintage:junit-vintage-engine:${project.junit5Version}"
-  testCompile('org.spockframework:spock-core:2.0-M2-groovy-2.5') {
+  testImplementation "junit:junit:${project.junitVersion}"
+  testImplementation 'org.mockito:mockito-core:2.28.2'
+  testRuntimeOnly "org.junit.vintage:junit-vintage-engine:${project.junit5Version}"
+  testImplementation('org.spockframework:spock-core:2.0-groovy-3.0') {
     exclude group: 'org.codehaus.groovy'
   }
 }
@@ -24,11 +28,14 @@ pluginBundle {
   vcsUrl = 'https://github.com/DiUS/pact-jvm.git'
   description = 'Gradle plugin for verifying pacts against a provider.'
   tags = ['pact', 'cdc', 'consumerdrivencontracts', 'microservicetesting']
+}
 
+gradlePlugin {
   plugins {
     pactProviderPlugin {
       id = 'au.com.dius.pact'
       displayName = 'Gradle Pact Provider plugin'
+      implementationClass = 'au.com.dius.pact.provider.gradle.PactPlugin'
     }
   }
 }