Fix onChange property trigger

• Now the onChange property callback is triggered when the MUIRichTextEditor's state changes. (#146)

Update Link component

• Use material-ui's Link component for links in the editor (#147)
  ⚠️ The default style for links have been changed. For using the previous style a custom theme should be used setting text-decoration: "underline" and color: "inherit" properties.

Fix read only rendering

• Fix a bug that prevent custom styles rendering correctly when read only was set along with a default value (#140 #149)

Update package dependencies

• Updated required package dependencies

Fix UI bugs

• Fix a bug that move the cursor to the end when the readOnly mode was set along with a defaultValue. (#142)
• Fix a bug that did not connected the exposed anchorLink class name with the Link component. (#135)

Fix bugs

• Fix list controls swapped behavior. (#139)
  ⚠️ This may swap lists on saved documents using previous versions.
• Fix a bug that prevent custom styles rendering correctly when setting a default value. (#140)

Fix TSelectionInfo type

• Fix entityType property type of TSelectionInfo type in utils #133

Fix popover behavior

• Fix assignment issue #133
• Fix focus when a popover is dismissed without adding a value.

Add onFocus and onBlur props

• Added onFocus property for MUIRichTextEditor (PR #123 mentioned in #98)
• Added onBlur property for MUIRichTextEditor. (PR #123 mentioned in #98)

Add handleDroppedFiles property

• Added handleDroppedFiles draft-js property on MUIRichTextEditor's draftEditorProps prop.
• Exported TMUIRichTextEditor props type. #119
• Updated async image upload example with a drop file into editor scenario.