escape back tick due to pypi error

Author: evereux

README.rst

@@ -107,8 +107,7 @@ Prior to running the tests please ensure CATIA V5 has the following
 configuration settings:
 
 * CGR cache system must be disabled.
-* Parameter names must not have back ticks enabled. Tools > Options > General >
-Parameters and Measure > Knowledge > Parameter Names > Surrounded by the ` symbol.
+* Parameter names must not have back ticks enabled. Tools > Options > General > Parameters and Measure > Knowledge > Parameter Names > Surrounded by the \` symbol.
 
 On the first run, during the running of the tests, the test suite will create
 the CATIA drawing, products and part it requires to run in the folder