correct path to home folder

[tiagofilipe12]

This corrects the path of the "require" to the bionode-watermill home folder.

[codecov-io]

Codecov Report

Merging #48 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #48   +/-   ##
=======================================
  Coverage   80.64%   80.64%           
=======================================
  Files          36       36           
  Lines         806      806           
  Branches       99       99           
=======================================
  Hits          650      650           
  Misses        156      156

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[thejmazz]

Maybe eventually we can use some variable or something for this path among different example files. they essentially need to require what is defined by main in package.json to simulate an npm install