Fix indication of code_rate

code_rate needs to be in the range 0 to 1, excluding the zero itself.

Author: eSoares

commpy/links.py

@@ -171,7 +171,7 @@ def link_performance(self, SNRs, tx_max, err_min, send_chunk=None, code_rate: fl
                       so it should be large enough regarding the code type.
                       *Default*: send_chunck = err_min
 
-        code_rate : float in (0,1)
+        code_rate : float in (0,1]
                     Rate of the used code.
                     *Default*: 1 i.e. no code.