[README] Add note about 2.0 branch not maintained anymore
[README] Add note about 2.0 branch not maintained anymore

egeloen/IvoryCKEditorBundle,egeloen/IvoryCKEditorBundle,browserlondon/IvoryCKEditorBundle,browserlondon/IvoryCKEditorBundle,arosslau/IvoryCKEditorBundle,arosslau/IvoryCKEditorBundle,browserlondon/IvoryCKEditorBundle,gnat42/IvoryCKEditorBundle,cordoval/IvoryCKEditorBundle,markusmichel/IvoryCKEditorBundle,egeloen/IvoryCKEditorBundle,WouterJ/IvoryCKEditorBundle,browserlondon/IvoryCKEditorBundle,markusmichel/IvoryCKEditorBundle,gnat42/IvoryCKEditorBundle,WouterJ/IvoryCKEditorBundle,egeloen/IvoryCKEditorBundle,gnat42/IvoryCKEditorBundle,markusmichel/IvoryCKEditorBundle,cordoval/IvoryCKEditorBundle,WouterJ/IvoryCKEditorBundle,WouterJ/IvoryCKEditorBundle,arosslau/IvoryCKEditorBundle,gnat42/IvoryCKEditorBundle,markusmichel/IvoryCKEditorBundle,cordoval/IvoryCKEditorBundle,arosslau/IvoryCKEditorBundle,cordoval/IvoryCKEditorBundle