refactor(ContentSecurityPolicyHeaderWriterTest): use AssertJ instead of Hamcrest for assertions.

Part of #1035

Author: php-coder

README.md

@@ -43,6 +43,6 @@ If you are programmer/sysadmin or you just feeling that you are able to run a lo
 * *Database migrations*: Liquibase
 * *Validation*: JSR-303 (Hibernate Validator)
 * *Logging*: Slf4j (Logback)
-* *Unit tests*: Groovy and Spock Framework (for Java code), jasmine (for JavaScript code)
+* *Unit tests*: Groovy with Spock Framework or JUnit (for Java code), jasmine (for JavaScript code)
 * *Integration tests*: Selenium3, RobotFramework, WireMock
-* *Others*: Lombok, Togglz, WebJars
+* *Others*: Lombok, Togglz, WebJars, AssertJ

pom.xml

@@ -373,13 +373,6 @@
 			<scope>test</scope>
 		</dependency>
 
-		<dependency>
-			<groupId>org.hamcrest</groupId>
-			<artifactId>hamcrest-library</artifactId>
-			<version>${hamcrest.version}</version>
-			<scope>test</scope>
-		</dependency>
-		
 		<dependency>
 			<groupId>org.seleniumhq.selenium</groupId>
 			<artifactId>htmlunit-driver</artifactId>
@@ -482,9 +475,6 @@
 		<!-- Redefine default value from spring-boot-dependencies (https://github.com/spring-projects/spring-boot/blob/v1.5.22.RELEASE/spring-boot-dependencies/pom.xml) -->
 		<h2.version>1.4.199</h2.version>
 
-		<!-- Redefine default value from spring-boot-dependencies (https://github.com/spring-projects/spring-boot/blob/v1.5.22.RELEASE/spring-boot-dependencies/pom.xml) -->
-		<hamcrest.version>1.3</hamcrest.version>
-		
 		<!-- Redefine default value from spring-boot-dependencies (https://github.com/spring-projects/spring-boot/blob/v1.5.22.RELEASE/spring-boot-dependencies/pom.xml) -->
 		<hibernate-validator.version>5.4.2.Final</hibernate-validator.version>