Add additional dependency info to README

Author: oddstr13

README.md

@@ -21,4 +21,9 @@ pip install --editable ./syrup
 
 External dependencies
 =====================
- * NSIS - https://nsis.sourceforge.io/Download
+ * Git (For installing from git) - https://git-scm.com/
+ * Python >= 3.5 - https://python.org/
+ * NSIS >= 3.04 - https://nsis.sourceforge.io/Download \
+   The following packages works for Mint 19 "tessa" (Ubuntu 18.04 "bionic"):
+    - https://packages.ubuntu.com/disco/amd64/nsis/download  
+    - https://packages.ubuntu.com/disco/all/nsis-common/download