diff --git a/.travis.yml b/.travis.yml
index f2cbd0d..e6450cd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,45 +1,21 @@
 language: python
 python:
-  - '2.7'
-  - '3.2'
-  - '3.3'
-  - '3.4'
-  - '3.5'
+  - 2.7
+  - 3.5
+  - 3.6
+  - 3.7
+  - 3.8
   - pypy
 cache:
   directories:
     - $HOME/.cache/pip
-sudo: false
 matrix:
   fast_finish: true
-
-addons:
-  apt:
-    packages:
-    - libcurl4-openssl-dev
-    - python-numpy
-    - python-opencv
-    - libopencv-dev
-    - libjpeg-dev
-    - libpng-dev
-    - libx264-dev
-    - libass-dev
-    - libvpx1
-    - libvpx-dev
-    - libwebp-dev
-    - webp
-    - gifsicle
-    - python-numpy
-    - python-scipy
-    - cython
 install:
   - make setup
-  # Coveralls 4.0 doesn't support Python 3.2
-  - if [ "$TRAVIS_PYTHON_VERSION" == "3.2" ]; then travis_retry pip install coverage==3.7.1; fi
   - pip install coveralls
 
 script: make ci_test
 
 after_success:
   coveralls
-
diff --git a/libthumbor/django/views.py b/libthumbor/django/views.py
index ed2dcd6..fe128d5 100644
--- a/libthumbor/django/views.py
+++ b/libthumbor/django/views.py
@@ -38,14 +38,14 @@ def generate_url(request):
     try:
         if 'width' in args:
             args['width'] = int(args['width'])
-    except ValueError as e:
+    except ValueError:
         error_message = "The width value '%s' is not an integer." % \
             args['width']
 
     try:
         if 'height' in args:
             args['height'] = int(args['height'])
-    except ValueError as e:
+    except ValueError:
         error_message = "The height value '%s' is not an integer." % \
             args['height']
 
@@ -55,13 +55,13 @@ def generate_url(request):
                 (int(args['crop_left']), int(args['crop_top'])),
                 (int(args['crop_right']), int(args['crop_bottom']))
             )
-    except KeyError as e:
+    except KeyError:
         error_message = '''
             Missing values for cropping.
             Expected all 'crop_left', 'crop_top',
             'crop_right', 'crop_bottom' values.
         '''
-    except ValueError as e:
+    except ValueError:
         error_message = '''
             Invalid values for cropping.
             Expected all 'crop_left', 'crop_top',
diff --git a/libthumbor/url.py b/libthumbor/url.py
index 977462d..538abc6 100644
--- a/libthumbor/url.py
+++ b/libthumbor/url.py
@@ -154,12 +154,12 @@ def get_url_parts(**options):
 class Url(object):
 
     unsafe_or_hash = r'(?:(?:(?P<unsafe>unsafe)|(?P<hash>.+?))/)?'
-    debug = '(?:(?P<debug>debug)/)?'
-    meta = '(?:(?P<meta>meta)/)?'
-    trim = '(?:(?P<trim>trim(?::(?:top-left|bottom-right))?(?::\d+)?)/)?'
-    crop = '(?:(?P<crop_left>\d+)x(?P<crop_top>\d+):(?P<crop_right>\d+)x(?P<crop_bottom>\d+)/)?'
-    fit_in = '(?:(?P<adaptive>adaptive-)?(?P<full>full-)?(?P<fit_in>fit-in)/)?'
-    dimensions = '(?:(?P<horizontal_flip>-)?(?P<width>(?:\d+|orig))?x(?P<vertical_flip>-)?(?P<height>(?:\d+|orig))?/)?'
+    debug = r'(?:(?P<debug>debug)/)?'
+    meta = r'(?:(?P<meta>meta)/)?'
+    trim = r'(?:(?P<trim>trim(?::(?:top-left|bottom-right))?(?::\d+)?)/)?'
+    crop = r'(?:(?P<crop_left>\d+)x(?P<crop_top>\d+):(?P<crop_right>\d+)x(?P<crop_bottom>\d+)/)?'
+    fit_in = r'(?:(?P<adaptive>adaptive-)?(?P<full>full-)?(?P<fit_in>fit-in)/)?'
+    dimensions = r'(?:(?P<horizontal_flip>-)?(?P<width>(?:\d+|orig))?x(?P<vertical_flip>-)?(?P<height>(?:\d+|orig))?/)?'
     halign = r'(?:(?P<halign>left|right|center)/)?'
     valign = r'(?:(?P<valign>top|bottom|middle)/)?'
     smart = r'(?:(?P<smart>smart)/)?'