fix compatibility with PySDM 2.22 (terminal velocity attribute) (#239)

Author: slayoo

.github/workflows/pylint.yml

@@ -24,4 +24,4 @@ jobs:
         pip install -e .[tests]
         pip install -r .binder/requirements.txt
     - run: pylint --unsafe-load-any-extension=y --disable=fixme,no-member,trailing-newlines,missing-module-docstring,missing-class-docstring,missing-function-docstring,unnecessary-pass $(git ls-files '*.py')
-    - run: nbqa pylint --unsafe-load-any-extension=y --disable=fixme,no-member,duplicate-code,wrong-import-position,ungrouped-imports,trailing-whitespace,missing-function-docstring,missing-module-docstring $(git ls-files '*.ipynb')
+    - run: nbqa pylint --unsafe-load-any-extension=y --disable=fixme,no-member,duplicate-code,wrong-import-position,ungrouped-imports,trailing-whitespace,missing-function-docstring,missing-module-docstring,unsubscriptable-object,invalid-name $(git ls-files '*.ipynb')

examples/terminal_velocities.ipynb

@@ -11,7 +11,6 @@
     "from PySDM.backends import CPU\n",
     "from PySDM.physics import si\n",
     "from PySDM.environments import Box\n",
-    "from PySDM.dynamics import Displacement\n",
     "import numpy as np\n",
     "from matplotlib import pyplot\n",
     "from open_atmos_jupyter_utils import show_plot"
@@ -36,7 +35,7 @@
    "source": [
     "builder = Builder(n_sd=100, backend=CPU())\n",
     "builder.set_environment(Box(dt=np.nan, dv=np.nan))\n",
-    "builder.add_dynamic(Displacement())\n",
+    "builder.request_attribute('terminal velocity')\n",
     "particulator = builder.build(attributes={'n': np.ones_like(volumes), 'volume': volumes})"
    ]
   },