Fixed #511 - favicon is only available after login

src/main/java/de/deadlocker8/budgetmaster/authentication/WebSecurityConfig.java

@@ -43,7 +43,7 @@ public class WebSecurityConfig extends WebSecurityConfigurerAdapter
 				.and()
 
 				.authorizeRequests()
-				.antMatchers("/css/**", "/js/**",  "/images/**", "/webjars/**").permitAll()
+				.antMatchers("/css/**", "/js/**",  "/images/**", "/webjars/**", "/favicon.ico").permitAll()
 				.antMatchers("/**").authenticated()
 				.antMatchers("/login").permitAll()
 				.and()