Use hash based headline declaration

README.md

-Spring Boot - Maven 3 - CentOS Docker image
-========================================
+# Spring Boot - Maven 3 - CentOS Docker image
 
 This repository contains the sources and
 [Dockerfile](https://github.com/codecentric/springboot-maven3-centos/blob/master/Dockerfile)
@@ -10,8 +9,7 @@ or using [S2I](https://github.com/openshift/source-to-image).
 This image is heavily inspired by the awesome [openshift/sti-ruby](https://github.com/openshift/sti-ruby/)
 builder images.
 
-Usage
----------------------
+## Usage
 
 To build a simple springboot-sample-app application using standalone S2I and then run the resulting image with Docker execute:
 
@@ -26,8 +24,7 @@ $ docker run -p 8080:8080 spring-boot-app
 $ curl 127.0.0.1:8080
 ```
 
-Repository organization
-------------------------
+## Repository organization
 
 * **`s2i/bin/`**
 
@@ -53,8 +50,7 @@ Repository organization
       archiving those. In this image, this script will archive the
       `/opt/java/.m2` directory.
 
-Environment variables
----------------------
+## Environment variables
 
 *  **APP_ROOT** (default: '.')
 
@@ -62,8 +58,7 @@ Environment variables
     application GIT repository. In case your application is located in a
     sub-folder, you can set this variable to a *./myapplication*.
 
-Contributing
-------------
+## Contributing
 
 In order to test your changes to this STI image or to the STI scripts, you can
 use the `test/run` script. Before that, you have to build the 'candidate' image:
@@ -75,7 +70,6 @@ $ docker build -t codecentric/springboot-maven3-centos-candidate .
 After that you can execute `./test/run`. You can also use `make test` to
 automate this.
 
-Copyright
---------------------
+## Copyright
 
 Released under the Apache License 2.0. See the [LICENSE](https://github.com/codecentric/springboot-maven3-centos/blob/master/LICENSE) file.