update: no vue-2 compatability (doesn't work with current build)

* README.md

src/components/Edges/BezierEdge.tsx

@@ -1,4 +1,4 @@
-import { computed, CSSProperties, defineComponent, PropType } from 'vue-demi';
+import { computed, CSSProperties, defineComponent, PropType } from 'vue';
 
 import EdgeText from './EdgeText';
 

src/components/Edges/EdgeAnchor.tsx

@@ -1,5 +1,5 @@
 import { Position } from '../../types';
-import { defineComponent, HTMLAttributes, PropType } from 'vue-demi';
+import { defineComponent, HTMLAttributes, PropType } from 'vue';
 
 const shiftX = (x: number, shift: number, position: Position): number => {
   if (position === Position.Left) return x - shift;

src/components/Edges/EdgeText.tsx

@@ -1,5 +1,5 @@
 import { EdgeTextProps, Rect } from '../../types';
-import { defineComponent, PropType, ref, watch } from 'vue-demi';
+import { defineComponent, PropType, ref, watch } from 'vue';
 
 const EdgeText = defineComponent({
   props: {

src/components/Edges/SmoothStepEdge.tsx

@@ -1,4 +1,4 @@
-import { defineComponent } from 'vue-demi';
+import { defineComponent } from 'vue';
 
 import EdgeText from './EdgeText';
 import { getMarkerEnd, getCenter } from './utils';

src/components/Edges/StepEdge.tsx

@@ -1,4 +1,4 @@
-import { defineComponent } from 'vue-demi';
+import { defineComponent } from 'vue';
 
 import { EdgeSmoothStepProps } from '../../types';
 import SmoothStepEdge from './SmoothStepEdge';

src/components/Edges/StraightEdge.tsx

@@ -1,4 +1,4 @@
-import { defineComponent } from 'vue-demi';
+import { defineComponent } from 'vue';
 
 import EdgeText from './EdgeText';
 import { getMarkerEnd } from './utils';

src/components/Edges/wrapEdge.tsx

@@ -1,4 +1,4 @@
-import { Component, computed, defineComponent, ref } from 'vue-demi';
+import { Component, computed, defineComponent, ref } from 'vue';
 
 import store from '../../store';
 import { Edge, EdgeProps, Position, WrapEdgeProps } from '../../types';