Re-compiling dependencies in examples [ci skip]

Because security alert from GitHub came

examples/dev-requirements.txt

@@ -2,32 +2,29 @@
 # This file is autogenerated by pip-compile
 # To update, run:
 #
-#    pip-compile --output-file dev-requirements.txt dev-requirements.in
+#    pip-compile -U dev-requirements.in
 #
 apipkg==1.5               # via execnet
-atomicwrites==1.2.1       # via pytest
-attrs==18.2.0             # via pytest
+atomicwrites==1.3.0       # via pytest
+attrs==19.1.0             # via pytest
 autopep8==1.4.3
 click==7.0                # via flask, pip-tools
 docutils==0.14
-execnet==1.5.0            # via pytest-cache
+execnet==1.6.0            # via pytest-cache
 flask==1.0.2
-funcsigs==1.0.2           # via pytest
 itsdangerous==1.1.0       # via flask
-jinja2==2.10              # via flask
-markupsafe==1.1.0         # via jinja2
-more-itertools==5.0.0     # via pytest
-pathlib2==2.3.3           # via pytest
+jinja2==2.10.1            # via flask
+markupsafe==1.1.1         # via jinja2
+more-itertools==7.0.0     # via pytest
 pep8==1.7.1               # via pytest-pep8
-pip-tools==3.2.0
-pluggy==0.8.1             # via pytest
-py==1.7.0                 # via pytest
-pycodestyle==2.4.0        # via autopep8
+pip-tools==3.6.0
+pluggy==0.9.0             # via pytest
+py==1.8.0                 # via pytest
+pycodestyle==2.5.0        # via autopep8
 pytest-cache==1.0         # via pytest-pep8
 pytest-pep8==1.0.6
 pytest-pythonpath==0.7.3
-pytest==4.1.1             # via pytest-cache, pytest-pep8, pytest-pythonpath
-scandir==1.9.0            # via pathlib2
-six==1.12.0               # via more-itertools, pathlib2, pip-tools, pytest
-werkzeug==0.14.1          # via flask
-wheel==0.32.3
+pytest==4.4.0             # via pytest-cache, pytest-pep8, pytest-pythonpath
+six==1.12.0               # via pip-tools, pytest
+werkzeug==0.15.2          # via flask
+wheel==0.33.1

examples/prod-requirements.txt

@@ -2,11 +2,11 @@
 # This file is autogenerated by pip-compile
 # To update, run:
 #
-#    pip-compile --output-file prod-requirements.txt prod-requirements.in
+#    pip-compile -U prod-requirements.in
 #
 click==7.0                # via flask
 flask==1.0.2
 itsdangerous==1.1.0       # via flask
-jinja2==2.10              # via flask
-markupsafe==1.1.0         # via jinja2
-werkzeug==0.14.1          # via flask
+jinja2==2.10.1            # via flask
+markupsafe==1.1.1         # via jinja2
+werkzeug==0.15.2          # via flask