Add a changelog entry about deprecated language features.
Add a changelog entry about deprecated language features.

shakirbsm/dealii,angelrca/dealii,kalj/dealii,spco/dealii,sairajat/dealii,sairajat/dealii,naliboff/dealii,danshapero/dealii,angelrca/dealii,kalj/dealii,pesser/dealii,spco/dealii,kalj/dealii,danshapero/dealii,shakirbsm/dealii,danshapero/dealii,EGP-CIG-REU/dealii,sairajat/dealii,kalj/dealii,JaeryunYim/dealii,spco/dealii,JaeryunYim/dealii,JaeryunYim/dealii,spco/dealii,naliboff/dealii,jperryhouts/dealii,JaeryunYim/dealii,shakirbsm/dealii,JaeryunYim/dealii,danshapero/dealii,JaeryunYim/dealii,kalj/dealii,spco/dealii,spco/dealii,spco/dealii,EGP-CIG-REU/dealii,sairajat/dealii,pesser/dealii,pesser/dealii,angelrca/dealii,danshapero/dealii,sairajat/dealii,naliboff/dealii,naliboff/dealii,jperryhouts/dealii,EGP-CIG-REU/dealii,jperryhouts/dealii,jperryhouts/dealii,naliboff/dealii,kalj/dealii,angelrca/dealii,JaeryunYim/dealii,EGP-CIG-REU/dealii,shakirbsm/dealii,shakirbsm/dealii,danshapero/dealii,pesser/dealii,kalj/dealii,shakirbsm/dealii,pesser/dealii,pesser/dealii,danshapero/dealii,EGP-CIG-REU/dealii,naliboff/dealii,EGP-CIG-REU/dealii,sairajat/dealii,shakirbsm/dealii,angelrca/dealii,jperryhouts/dealii,naliboff/dealii,jperryhouts/dealii,EGP-CIG-REU/dealii,angelrca/dealii,angelrca/dealii,jperryhouts/dealii,sairajat/dealii,pesser/dealii