Describe the bug

When you pass a filter-object to b-table the filter-function will not be triggered when the properties of the object change. (No reactivity)
This happens since version 2.0.0.

Steps to reproduce the bug

1. Open Demo-Link https://codesandbox.io/s/gallant-curie-dkrsc
2. Change Text in the Filter -> Nothing happens
3. Change the version of bootstrap-vue to 2.0.0-rc.28
4. Change Text in the Filter -> Table is correctly filtered

Expected behavior

The Table is filtered according to the entered value

Versions

Libraries:

• BootstrapVue: 2.0.0
• Bootstrap: 4.3.1
• Vue: 2.6.10

Environment:

• Device: Mac
• OS: macOS Mojave
• Browser: Chrome
• Version: 76

Demo link

https://codesandbox.io/s/gallant-curie-dkrsc