Fix tox error for NPM test

Author: bjk7119

tox.ini

@@ -48,14 +48,13 @@ commands =
   fosslight_dependency -v
   # Test for PEP8
   pytest -v --flake8
-   # Test for Pypi
+  # Test for Pypi
   fosslight_dependency -p tests/test_pypi -o tests/result/pip
   # Test for NPM (without optional command)
-  npm install --prefix {toxworkdir}/test_npm1 -g license-checker
+  npm install --prefix {toxworkdir}/test_npm1 license-checker
   fosslight_dependency -p tests/test_npm1 -o tests/result/npm1
   # Test for NPM (with optional command)
-  npm install --prefix {toxworkdir}/test_npm2 -g license-checker
-  npm install --prefix {toxworkdir}/test_npm2
+  npm install --prefix {toxworkdir}/test_npm2 license-checker
   fosslight_dependency -p tests/test_npm2 -o tests/result/npm2 -m npm
   # Test for Maven (without optional command)
   fosslight_dependency -p tests/test_maven1/lombok.maven -o tests/result/maven1