Fix typo and URL in README.md

There was a typo in the instructions to build the docker images. This
commit fixes that typo. The URL of the git repo was also using an
unofficial version, that is now also fixed.

README.md

@@ -52,10 +52,10 @@ EvoSuite has a container image available on [Docker Hub](https://hub.docker.com/
 or by manually building the image locally:
 
 ```
-git clone github.com/EvoSuite/evosuite.git
+git clone https://github.com/EvoSuite/evosuite.git
 cd evosuite
 docker build -f Dockerfile.java8 . --tag evosuite/evosuite:latest-java-8
-docker build -f Dockerfile.java11 . --tage evosuite/evosuite:latest-java-11
+docker build -f Dockerfile.java11 . --tag evosuite/evosuite:latest-java-11
 ```
 
 EvoSuite can be called as follows: