Update README.md

disco/README.md

@@ -1,6 +1,6 @@
 # Disco for RISC-V HiFive1
 
-Assuming RISC-V toolchain, SDK and openocd is installed
+Assuming RISC-V toolchain, SDK and openocd are installed
 
 * ``make``: compile repository
-* ``make run``: uses ``openocd`` and GBD to upload and start executing on HiFive1
+* ``make run``: uses ``openocd`` and GBD to upload and start executing on HiFive1