Change github link to version 1.2.0

Author: hagenw

theory_of_sound_field_synthesis.tex

@@ -172,7 +172,7 @@
 % --- VARIABLES --------------------------------------------------------------
 % fix spaces after defined variables, if there is a punctuation               |
 \usepackage{xspace}%                                                          |
-\def \GITHUBBASE {http://github.com/sfstoolbox/sfs-documentation/tree/master}%|
+\def \GITHUBBASE {http://github.com/sfstoolbox/sfs-documentation/blob/1.2.0}% |
 \def \SFS {http://github.com/sfstoolbox/sfs/blob/1.2.0}           % SFS url   |
 \def \AMT {http://github.com/hagenw/amtoolbox/blob/thesis}        % AMT url   |
 \def \PATH {.}                                                    % basepath  |