adds mypy to test command and adds fixes for flake issues

do.sh

@@ -12,6 +12,7 @@ build() {
 test() {
    echo "I am ${FUNCNAME[0]}ing"
    poetry run flake8
+   poetry run mypy pysuperconductor
    poetry run pytest
 }
 

pysuperconductor/os_gap_calc.py

@@ -1,20 +1,30 @@
-import numpy # type: ignore
-import scipy.integrate as integrate # type: ignore
-import scipy.optimize # type: ignore
+import numpy  # type: ignore
+import scipy.integrate as integrate  # type: ignore
+import scipy.optimize  # type: ignore
 
 
 def energy(freq: float, delta: float) -> float:
 	return numpy.sqrt(freq ** 2 + delta ** 2)
 
 
-def gap_integrand_function(xi: float, temp: float, delta: float, mu_star: float) -> float:
+def gap_integrand_function(
+	xi: float,
+	temp: float,
+	delta: float,
+	mu_star: float
+) -> float:
 	big_e = energy(xi, delta)
 	if temp == 0:
 		return (1 / (2 * big_e)) * (2 * numpy.heaviside(big_e - mu_star, .5) - 1)
 	return numpy.tanh((big_e - mu_star) / (2 * temp)) / (2 * big_e)
 
 
-def gap_integral(temp: float, delta: float, mu_star: float, debye_frequency: float) -> float:
+def gap_integral(
+	temp: float,
+	delta: float,
+	mu_star: float,
+	debye_frequency: float
+) -> float:
 	def integrand(xi: float) -> float:
 		# the 2 here is to account for the symmetry in the integration range
 		# to cut the integral to zero to omega_debyeh