Update README.md

Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>

advanced_programming/connor_stevens/README.md

@@ -96,5 +96,12 @@ $$M_{\infty} = \frac{1}{1+ \exp(-(V+57mV) / 6.2mV)}$$
 
 $$H_{\infty} = \frac{1}{1+ \exp(-(V+81mV) / 4mV)}$$
 
-$$\tau_M = 0.612 ms + \frac{1ms}{\exp(-(V+132mV)/16.7 mV) + \exp(-(V+16.8mV)/18.2 mV)}
+$$\tau_M = 0.612 ms + \frac{1ms}{\exp(-(V+132mV)/16.7 mV) + \exp(-(V+16.8mV)/18.2 mV)}$$
 
+if $V < -80 mV$:
+
+$$\tau_H = 1ms \exp((V+467mV)/66.6mV)$$
+
+else:
+
+$$\tau_H = 28ms + 1ms \exp(-(V+22mV)/10.5mV)$$