README/Dependencies - Fixes Following Review

Changing "fasm" to "pyfasm" was incorrect; it is unrelated to this project.
Updated this line in ''requirements.txt'' to install "fasm" from the submodule
''third_party/fasm''.  Also, removed aliasing of "python" in README.

Signed-off-by: Jake Mercer <jmercer04@qub.ac.uk>

README.md

@@ -46,10 +46,6 @@ Build the C++ tools:
     make build
 
 ### Step 5: ###
-Alias python to python3 to avoid using python2 accidentally:
-
-    alias python=python3
-
 Choose one of the following options:
 
 (Option 1) - Install the Python environment locally

requirements.txt

@@ -1,4 +1,4 @@
-pyfasm
+-e third_party/fasm
 intervaltree
 junit-xml
 numpy