Remove future usage

There's no good reason to use it, and the future package is a pain to
install as it easily breaks the system and compatibility with other
Python packages.

pytimeparse/timeparse.py

@@ -31,7 +31,6 @@ kinds of time expressions.
 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-from builtins import dict, int
 import re
 
 SIGN        = r'(?P<sign>[+|-])?'

setup.py

@@ -22,11 +22,6 @@ with open(path.join(HERE, 'pytimeparse', 'VERSION'), encoding='utf-8') as f:
 with open(path.join(HERE, 'README.rst'), encoding='utf-8') as f:
     LONG_DESCRIPTION = f.read()
 
-# http://stackoverflow.com/a/19719657/1062499
-INSTALL_REQUIRES = []
-if sys.version_info.major == 2:
-    INSTALL_REQUIRES.append('future >= 0.14')
-
 setup(
     name='pytimeparse',
 
@@ -81,12 +76,6 @@ setup(
     # simple. Or you can use find_packages().
     packages=find_packages(exclude=[]),
 
-    # List run-time dependencies here.  These will be installed by pip when your
-    # project is installed. For an analysis of "install_requires" vs pip's
-    # requirements files see:
-    # https://packaging.python.org/en/latest/requirements.html
-    install_requires=INSTALL_REQUIRES,
-
     # List additional groups of dependencies here (e.g. development dependencies).
     # You can install these using the following syntax, for example:
     # $ pip install -e .[dev,test]