Mfa Sample Depends on spring-security-crypto

Closes gh-18

servlet/spring-boot/java/authentication/username-password/mfa/build.gradle

@@ -14,6 +14,7 @@ dependencies {
 	implementation 'org.springframework.boot:spring-boot-starter-security'
 	implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
 	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.security:spring-security-crypto'
 
 	implementation 'com.j256.two-factor-auth:two-factor-auth:1.3'