Unable to build `aws-xray-sdk` on Python 3.6.2

[sanathkr]

Description:
When building aws-xray-sdk, it fails with Error: PythonPipBuilder:ResolveDependencies - {future==0.17.1(sdist), wrapt==1.10.11(sdist)}.

Interestingly enough this works fine on Python 3.6.4.

Steps to reproduce the issue:

1. Add aws-xray-sdk~=2.2.0 to requirements.txt
2. Switch to Python 3.6.2
3. sam build or sam build --use-container

Observed result:
Build should succeed

Expected result:
Build failed with message Error: PythonPipBuilder:ResolveDependencies - {future==0.17.1(sdist), wrapt==1.10.11(sdist)}.

Additional environment details (Ex: Windows, Mac, Amazon Linux etc)
Python version: 3.6.2
OS: Mac
Also fails on --use-container that builds inside a Docker container simulating Lambda like environment.

[sanathkr]

Turns out when you create a virtualenv using Python 3.6.2, it doesn't come with wheel installed. So pip fails to compile a sdist into a wheel.

Workaround: pip install wheel

Run sam build after installing the wheel will work.

We need to find a way to surface this to customers..

[sanathkr]

Fixed by #34

[elviento]

thanks @sanathkr

Workaround: pip install wheel