Coding style.

- Use a standard requirements.txt file for python dependencies.

install-dependencies

@@ -10,8 +10,8 @@ if [ $DIST_ID != "ubuntu" ]; then
     exit 1
 fi
 echo "Installing the dependencies of the eris script…"
-sudo apt --yes install python3-pip python3.9 util-linux python3-cwcwidth
-python3.9 -m pip install pyinotify pygments docopt pillow toml decorator pexpect
+sudo apt --yes install python3-pip python3.9 util-linux
+python3.9 -m pip install -r requirements.txt
 echo
 echo "Installing all the tools eris may need…"
 ./install-tools

requirements.txt

@@ -0,0 +1,8 @@
+pyinotify
+pygments
+docopt
+pillow
+toml
+decorator
+pexpect
+cwcwidth