diff --git a/.github/workflows/pcb-tools.yml b/.github/workflows/pcb-tools.yml
new file mode 100644
index 0000000..85038a7
--- /dev/null
+++ b/.github/workflows/pcb-tools.yml
@@ -0,0 +1,26 @@
+name: pcb-tools
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        python-version: [2.7, 3.5, 3.6, 3.7, 3.8]
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements-dev.txt
+    - name: Test with pytest
+      run: |
+        pip install pytest
+        pytest
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 7525487..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,21 +0,0 @@
-dist: precise
-language: python
-python:
-  - "2.7"
-  - "3.3"
-  - "3.4"
-  - "3.5"
-
-# command to install dependencies
-install:
-  - "pip install -r requirements.txt"
-  - "pip install -r test-requirements.txt"
-  - "pip install coveralls"
-
-# command to run tests
-script:
-  - make test-coverage
-
-# Coveralls
-after_success:
-  - coveralls
diff --git a/README.md b/README.md
index f741f80..42c90f4 100644
--- a/README.md
+++ b/README.md
@@ -48,11 +48,11 @@ Documentation:
 Development and Testing:
 ------------------------
 
-Dependencies for developing and testing pcb-tools are listed in test-requirements.txt. Use of a virtual environment is strongly recommended.
+Dependencies for developing and testing pcb-tools are listed in requirements-dev.txt. Use of a virtual environment is strongly recommended.
 
     $ virtualenv venv
     $ source venv/bin/activate
-    (venv)$ pip install -r test-requirements.txt
+    (venv)$ pip install -r requirements-dev.txt
     (venv)$ pip install -e .
 
 We use nose to run pcb-tools's suite of unittests and doctests.
diff --git a/doc-requirements.txt b/doc-requirements.txt
deleted file mode 100644
index a163c9b..0000000
--- a/doc-requirements.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-# Doc requirements
-Sphinx==1.2.3
-numpydoc==0.5
-
diff --git a/gerber/excellon_statements.py b/gerber/excellon_statements.py
index bcf35e4..2c50ef9 100644
--- a/gerber/excellon_statements.py
+++ b/gerber/excellon_statements.py
@@ -23,6 +23,7 @@ Excellon Statements
 
 import re
 import uuid
+import itertools
 from .utils import (parse_gerber_value, write_gerber_value, decimal_string,
                     inch, metric)
 
@@ -151,8 +152,7 @@ class ExcellonTool(ExcellonStatement):
         tool : Tool
             An ExcellonTool representing the tool defined in `line`
         """
-        commands = re.split('([BCFHSTZ])', line)[1:]
-        commands = [(command, value) for command, value in pairwise(commands)]
+        commands = pairwise(re.split('([BCFHSTZ])', line)[1:])
         args = {}
         args['id'] = id
         nformat = settings.format
@@ -973,6 +973,7 @@ def pairwise(iterator):
 
     e.g. [1, 2, 3, 4, 5, 6] ==> [(1, 2), (3, 4), (5, 6)]
     """
-    itr = iter(iterator)
-    while True:
-        yield tuple([next(itr) for i in range(2)])
+    a, b = itertools.tee(iterator)
+    itr = zip(itertools.islice(a, 0, None, 2), itertools.islice(b, 1, None, 2))
+    for elem in itr:
+        yield elem
diff --git a/gerber/utils.py b/gerber/utils.py
index 817a36e..3d39df9 100644
--- a/gerber/utils.py
+++ b/gerber/utils.py
@@ -123,6 +123,10 @@ def write_gerber_value(value, format=(2, 5), zero_suppression='trailing'):
     value : string
         The specified value as a Gerber/Excellon-formatted string.
     """
+    
+    if format[0] == float:
+        return "%f" %value
+    
     # Format precision
     integer_digits, decimal_digits = format
     MAX_DIGITS = integer_digits + decimal_digits
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..c1e695d
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,5 @@
+# install base requirements
+-r requirements.txt
+
+coverage==4.5.4
+nose==1.3.7
diff --git a/requirements-docs.txt b/requirements-docs.txt
new file mode 100644
index 0000000..128ae8b
--- /dev/null
+++ b/requirements-docs.txt
@@ -0,0 +1,6 @@
+# install base requirements
+-r requirements.txt
+
+# documentation generation support
+Sphinx==2.2.1
+numpydoc==0.9.1
diff --git a/requirements.txt b/requirements.txt
index a7f5f01..1f769f2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-## The following requirements were added by pip --freeze:
+# cairo rendering support
 cairocffi==0.6
diff --git a/test-requirements.txt b/test-requirements.txt
deleted file mode 100644
index 826da33..0000000
--- a/test-requirements.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-# Test requirements
-cairocffi==0.6
-coverage==3.7.1
-nose==1.3.4