Bump pyyaml from 3.12 to 5.4 in /requirements

requirements/requirements-dev.txt

@@ -4,42 +4,114 @@
 #
 #    pip-compile --output-file requirements/requirements-dev.txt requirements/requirements-dev.in
 #
-apipkg==1.4               # via execnet
-astroid==1.6.4            # via pylint, pylint-plugin-utils, requirements-detector
-atomicwrites==1.1.5       # via pytest
-attrs==18.1.0             # via pytest
-dodgy==0.1.9              # via prospector
-execnet==1.5.0            # via pytest-cache
-flake8-polyfill==1.0.2    # via pep8-naming
+apipkg==1.4
+    # via execnet
+astroid==1.6.4
+    # via
+    #   pylint
+    #   pylint-plugin-utils
+    #   requirements-detector
+atomicwrites==1.1.5
+    # via pytest
+attrs==18.1.0
+    # via pytest
+dodgy==0.1.9
+    # via prospector
+execnet==1.5.0
+    # via pytest-cache
+flake8-polyfill==1.0.2
+    # via pep8-naming
 flake8==3.5.0
-isort==4.3.4              # via pylint, pytest-isort
-lazy-object-proxy==1.3.1  # via astroid
-mccabe==0.6.1             # via flake8, prospector, pylint
+    # via
+    #   -r requirements-dev.in
+    #   flake8-polyfill
+isort==4.3.4
+    # via
+    #   pylint
+    #   pytest-isort
+lazy-object-proxy==1.3.1
+    # via astroid
+mccabe==0.6.1
+    # via
+    #   flake8
+    #   prospector
+    #   pylint
 mock==2.0.0
-more-itertools==4.2.0     # via pytest
+    # via -r requirements-dev.in
+more-itertools==4.2.0
+    # via pytest
 mypy==0.600
-pbr==4.0.3                # via mock
-pep8-naming==0.7.0        # via prospector
-pluggy==0.6.0             # via pytest, tox
+    # via -r requirements-dev.in
+pbr==4.0.3
+    # via mock
+pep8-naming==0.7.0
+    # via prospector
+pluggy==0.6.0
+    # via
+    #   pytest
+    #   tox
 prospector==0.12.11
-py==1.5.3                 # via pytest, tox
-pycodestyle==2.3.1        # via flake8, prospector
-pydocstyle==2.1.1         # via prospector
-pyflakes==1.6.0           # via flake8, prospector
-pylint-common==0.2.5      # via prospector
-pylint-plugin-utils==0.2.6  # via prospector, pylint-common
-pylint==1.9.1             # via prospector, pylint-common, pylint-plugin-utils
-pytest-cache==1.0         # via pytest-isort
+    # via -r requirements-dev.in
+py==1.5.3
+    # via
+    #   pytest
+    #   tox
+pycodestyle==2.3.1
+    # via
+    #   flake8
+    #   prospector
+pydocstyle==2.1.1
+    # via prospector
+pyflakes==1.6.0
+    # via
+    #   flake8
+    #   prospector
+pylint-common==0.2.5
+    # via prospector
+pylint-plugin-utils==0.2.6
+    # via
+    #   prospector
+    #   pylint-common
+pylint==1.9.1
+    # via
+    #   prospector
+    #   pylint-common
+    #   pylint-plugin-utils
+pytest-cache==1.0
+    # via pytest-isort
 pytest-isort==0.2.0
+    # via -r requirements-dev.in
 pytest==3.6.0
+    # via
+    #   -r requirements-dev.in
+    #   pytest-cache
+    #   pytest-isort
 python-magic==0.4.15
-pyyaml==3.12              # via prospector
-requirements-detector==0.5.2  # via prospector
-setoptconf==0.2.0         # via prospector
-six==1.11.0               # via astroid, mock, more-itertools, pydocstyle, pylint, pytest, tox
-snowballstemmer==1.2.1    # via pydocstyle
+    # via -r requirements.txt
+pyyaml==5.4
+    # via prospector
+requirements-detector==0.5.2
+    # via prospector
+setoptconf==0.2.0
+    # via prospector
+six==1.11.0
+    # via
+    #   astroid
+    #   mock
+    #   more-itertools
+    #   pydocstyle
+    #   pylint
+    #   pytest
+    #   tox
+snowballstemmer==1.2.1
+    # via pydocstyle
 tox==3.0.0
-typed-ast==1.1.0          # via mypy
-virtualenv==16.0.0        # via tox
-wrapt==1.10.11            # via astroid
+    # via -r requirements-dev.in
+typed-ast==1.1.0
+    # via mypy
+virtualenv==16.0.0
+    # via tox
+wrapt==1.10.11
+    # via astroid
 xxhash==1.0.1
+    # via -r requirements.txt