Error if field type and method have the same name

Hey!

When I do `go generate ./...` I get an error.
```
package main

//go:generate moq -out mocks/some_iface.go . SomeIface

type SomeIface interface {
Begin()
BeginFunc()
}
```

Error:
`Type '*SomeIfaceMock' has both field and method named 'BeginFunc'`

Start by running the reported `go generate ./...` example and inspect the generated `mocks/some_iface.go` output for `SomeIfaceMock`. Trace the generator entry point that handles the `Begin` and `BeginFunc` names, then add a regression test showing generation succeeds when a field type and method share a name.

Written by the indexing model from the issue text.