Fix broken hyperlink in README.

Author: wb2osz

README.md

@@ -9,7 +9,7 @@ Why waste $200 and settle for mediocre receive performance from a 1980's technol
 
 ![](tnc-test-cd-results.png)
 
-Dire Wolf now includes [FX.25](https://en.wikipedia.org/wiki/FX.25_Forward_Error_Correction/) which adds Forward Error Correction (FEC) in a way that is completely compatible with existing systems.  If both ends are capable of FX.25, your information will continue to get through under conditions where regular AX.25 is completely useless.
+Dire Wolf now includes [FX.25](https://en.wikipedia.org/wiki/FX.25_Forward_Error_Correction) which adds Forward Error Correction (FEC) in a way that is completely compatible with existing systems.  If both ends are capable of FX.25, your information will continue to get through under conditions where regular AX.25 is completely useless.
 
 ![](fx25.png)