Fixing pipenv issues on Travis CI

- Updated README.md

.travis.yml

@@ -70,7 +70,10 @@ matrix:
     - os: osx
       language: generic
       python: "3.6"
-      before_install:
+      env:
+        - PIPENV_VENV_IN_PROJECT=1
+        - PIPENV_IGNORE_VIRTUALENVS=1
+      install:
         - brew upgrade python
         - pip install pipenv
         - pipenv --three

README.rst

@@ -84,7 +84,7 @@ Python 3 + Qt5 (Works on macOS High Sierra)
     python labelImg.py
     python  labelImg.py [IMAGE_PATH] [PRE-DEFINED CLASS FILE]
 
-*NEW* Python 3 Virtualenv + Binary
+**NEW** Python 3 Virtualenv + Binary  
 This avoids a lot of the QT / Python version issues,
 and gives you a nice .app file with a new SVG Icon
 in your /Applications folder.