Basic readme telling how to select symfony version

mateuszsip · mateuszsip · commit f73fda1eea49 · 2018-06-23T21:57:59.000+02:00
diff --git a/README.md b/README.md
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+Symfony docker
+======
+
+Usage
+------
+
+Run `docker-compose up -d`
+
+Choosing symfony version
+------
+
+To choose specific symfony version define `SYMFONY_VERSION` env variable for first run.
+
+Like:
+
+`SYMFONY_VERSION=3.4 docker-compose up -d`
