Update imports

Author: namurphy

src/plasmapy_calculator/main_interface.py

@@ -11,7 +11,7 @@
 import astropy.units as u
 from ipywidgets import widgets
 
-from plasmapy.utils.calculator.widget_helpers import (
+from plasmapy_calculator.widget_helpers import (
     _calculate_button,
     _CheckBox,
     _clear_button,

src/plasmapy_calculator/plasma_calculator.ipynb

@@ -21,9 +21,7 @@
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": [
-    "import plasmapy.utils.calculator.main_interface as pc"
-   ]
+   "source": "import plasmapy_calculator.main_interface as pc"
   },
   {
    "cell_type": "code",