refactor common dependencies in README.md

README.md

 # Zephir-Client
 
-# Install zephir-client as python script (recommended) :
+In order to install or build, you need to have (ubuntu package names are given):
+
+* a working "python3" installation (>= 3.6)
+* "python3-requests" : http://docs.python-requests.org/en/master/
+* "python3-setuptools" : https://pypi.org/project/setuptools/
+* "git" command line utility
 
-* You need to have "python3" (>= 3.6), with "python3-requests" and "python3-setuptools"
-* You also need to have "git" installed
+# Install zephir-client as python script (recommended) :
 
 * run "sudo install.sh"
 
@@ -15,7 +19,6 @@
 # Build zephir-client binary (alternate method) :
 
 * You need to have "pyinstaller" in your machine (https://www.pyinstaller.org/)
-* You also need "git" installed
 
 * Start build.sh :
 For now this scripts does this :