Update required ocaml version

README.md

@@ -2,24 +2,23 @@
 
 ## install ocaml and opam
 
-You can check if you have `ocaml` and `opam` using 
+You can check if you have `ocaml` and `opam` using
 
 ```
-ocaml --version ##>= 4.08.1
+ocaml --version ##>= 4.11.1
 opam --version ## >= 2.0.2
 ```
 
 ### If you don't have `ocaml` and `opam`
 
-
-* pre install step
+- pre install step
 
 ```
 sudo apt-get update
 sudo apt-get install m4 zlib1g-dev bubblewrap unzip
 ```
 
-* install step
+- install step
 
 install `ocaml` via `opam` according https://opam.ocaml.org/doc/Install.html
 
@@ -27,7 +26,7 @@ install `ocaml` via `opam` according https://opam.ocaml.org/doc/Install.html
 sh <(curl -sL https://raw.githubusercontent.com/ocaml/opam/master/shell/install.sh) # install opam
 ```
 
-* post install step
+- post install step
 
 ```
 opam init --compiler=4.08.1