Use project-version placeholder in documentation.

Closes gh-370.

README.adoc

@@ -161,7 +161,7 @@ the test cases). Example Maven configuration:
     <dependency>
         <groupId>org.springframework.cloud</groupId>
         <artifactId>spring-cloud-starter-vault-config</artifactId>
-        <version>{spring-cloud-version}</version>
+        <version>{project-version}</version>
     </dependency>
     <dependency>
         <groupId>org.springframework.boot</groupId>
@@ -565,4 +565,4 @@ Go to `File` -> `Settings` -> `Other settings` -> `Checkstyle`. There click on t
 - `checkstyle.suppressions.file` - default suppressions. Please point it to the Spring Cloud Build's, `spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xml` file either in your cloned repo or via the `https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xml` URL.
 - `checkstyle.additional.suppressions.file` - this variable corresponds to suppressions in your local project. E.g. you're working on `spring-cloud-contract`. Then point to the `project-root/src/checkstyle/checkstyle-suppressions.xml` folder. Example for `spring-cloud-contract` would be: `/home/username/spring-cloud-contract/src/checkstyle/checkstyle-suppressions.xml`.
 
-IMPORTANT: Remember to set the `Scan Scope` to `All sources` since we apply checkstyle rules for production and test sources.
+IMPORTANT: Remember to set the `Scan Scope` to `All sources` since we apply checkstyle rules for production and test sources.

docs/src/main/asciidoc/quickstart.adoc

@@ -121,7 +121,7 @@ the test cases). Example Maven configuration:
     <dependency>
         <groupId>org.springframework.cloud</groupId>
         <artifactId>spring-cloud-starter-vault-config</artifactId>
-        <version>{spring-cloud-version}</version>
+        <version>{project-version}</version>
     </dependency>
     <dependency>
         <groupId>org.springframework.boot</groupId>

docs/src/main/asciidoc/spring-cloud-vault.adoc

@@ -1,7 +1,7 @@
 = Spring Cloud Vault
 :github: https://github.com/spring-cloud/spring-cloud-vault
 :githubmaster: {github}/tree/master
-:revnumber: {spring-cloud-version}
+:revnumber: {project-version}
 :docslink: {githubmaster}/docs/src/main/asciidoc
 :toc: left
 :nofooter:
@@ -821,7 +821,7 @@ dependency.
     <dependency>
         <groupId>org.springframework.cloud</groupId>
         <artifactId>spring-cloud-vault-config-consul</artifactId>
-        <version>{spring-cloud-version}</version>
+        <version>{project-version}</version>
     </dependency>
 </dependencies>
 ----
@@ -871,7 +871,7 @@ dependency.
     <dependency>
         <groupId>org.springframework.cloud</groupId>
         <artifactId>spring-cloud-vault-config-rabbitmq</artifactId>
-        <version>{spring-cloud-version}</version>
+        <version>{project-version}</version>
     </dependency>
 </dependencies>
 ----
@@ -924,7 +924,7 @@ dependency.
     <dependency>
         <groupId>org.springframework.cloud</groupId>
         <artifactId>spring-cloud-vault-config-aws</artifactId>
-        <version>{spring-cloud-version}</version>
+        <version>{project-version}</version>
     </dependency>
 </dependencies>
 ----
@@ -995,7 +995,7 @@ backend path, e.g. `spring.cloud.vault.mysql.role.backend=database`.
     <dependency>
         <groupId>org.springframework.cloud</groupId>
         <artifactId>spring-cloud-vault-config-databases</artifactId>
-        <version>{spring-cloud-version}</version>
+        <version>{project-version}</version>
     </dependency>
 </dependencies>
 ----