Fix/reading dir as file

[love-bhardwaj]

• Ready for review
• Follows CONTRIBUTING rules
• Reviewed by Snyk internal team

What does this PR do?

Fixes issue reported in: #61

One tries to read the content of a file if it is a file and not a directory

Where should the reviewer start?

How should this be manually tested?

1. create a directory for a project (can be empty) that contains .snyk mkdir -p ~/test/my.snykProject/project
2. create an empty .snyk file in the project touch ~/test/my.snykProject/project/.snyk
3. change into project directory cd ~/test/my.snykProject/project
4. run snyk test

Any background context you want to provide?

What are the relevant tickets?

Screenshots

Additional questions

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