(Bugfix)|Change httbin error message to httpbin (#105)
(Bugfix)|Change httbin error message to httpbin (#105)

### Summary
- `httbin` does not exist as a pip package
- Change httbin to `httpbin` which can be found here https://pypi.org/project/httpbin/

### Implementation
- Update copy

### Test Plan
- `pip install httbin` should not work
- `pip install httpbin` should work
mindbody/Conduit,mindbody/Conduit