Bump assertj-core from 3.12.2 to 3.15.0 (#97)

Bumps [assertj-core](https://github.com/joel-costigliola/assertj-core) from 3.12.2 to 3.15.0.
- [Release notes](https://github.com/joel-costigliola/assertj-core/releases)
- [Commits](assertj/assertj@assertj-core-3.12.2...assertj-core-3.15.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

agent/build.gradle

@@ -58,7 +58,7 @@ dependencies {
     compileOnly 'io.projectreactor:reactor-core:3.2.5.RELEASE'
     compileOnly 'io.reactivex.rxjava2:rxjava:2.2.18'
 
-    jarFileTestCompile 'org.assertj:assertj-core:3.12.2'
+    jarFileTestCompile 'org.assertj:assertj-core:3.15.0'
     jarFileTestCompile 'junit:junit:4.13'
 }
 

example/build.gradle

@@ -46,7 +46,7 @@ dependencies {
     testCompile 'io.reactivex.rxjava2:rxjava:2.2.18'
 
     testCompile 'junit:junit:4.13'
-    testCompile 'org.assertj:assertj-core:3.14.0'
+    testCompile 'org.assertj:assertj-core:3.15.0'
 
     reactor_3_3_x 'io.projectreactor:reactor-core:3.3.0.RC1'
 }

junit-platform/build.gradle

@@ -24,7 +24,7 @@ dependencies {
 
     compileOnly 'org.junit.platform:junit-platform-launcher:1.0.0'
 
-    testCompile 'org.assertj:assertj-core:3.11.1'
+    testCompile 'org.assertj:assertj-core:3.15.0'
     testCompile 'io.projectreactor:reactor-core:3.2.2.RELEASE'
 
     testCompile 'org.junit.jupiter:junit-jupiter-api:5.6.0'