Add PECs/PMCs to feature list

README.md

@@ -12,6 +12,7 @@ electromagnetic simulations.
 * Stretched-coordinate PML boundaries (SCPML)
 * Functional versions of most operators
 * Anisotropic media (eps_xx, eps_yy, eps_zz, mu_xx, ...)
+* Arbitrary distributions of perfect electric and magnetic conductors (PEC / PMC)
 
 This package does *not* provide a fast matrix solver, though by default
 ```fdfd_tools.solvers.generic(...)``` will call

fdfd_tools/__init__.py

@@ -3,7 +3,7 @@ Electromagnetic FDFD simulation tools
 
 Tools for 3D and 2D Electromagnetic Finite Difference Frequency Domain (FDFD)
 simulations. These tools handle conversion of fields to/from vector form,
-creation of the wave operator matrix, stretched-coordinate PMLs,
+creation of the wave operator matrix, stretched-coordinate PMLs, PECs and PMCs,
 field conversion operators, waveguide mode operator, and waveguide mode
 solver.