Fixing missing filter processor properties in README

applications/processor/filter-processor/README.adoc

@@ -16,6 +16,7 @@ If the incoming type is `byte[]` and the content type is set to `text/plain` or
 == Options
 
 //tag::configuration-properties[]
+$$filter.function.expression$$:: $$A SpEL expression to apply.$$ *($$String$$, default: `$$<none>$$`)*
 //end::configuration-properties[]
 
 //end::ref-doc[]

functions/function/filter-function/pom.xml

@@ -24,6 +24,11 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-integration</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-configuration-processor</artifactId>
+            <scope>provided</scope>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>