Added deprecation notice to edrget + changelog (#4641)

* Updated changelog with edrget deprecation

* Added deprecation notice

Co-authored-by: Austin Sanders <arsanders@ugs.gov>

CHANGELOG.md

@@ -38,6 +38,10 @@ release.
 ### Added
 - Added the ability to search filenames in measure's drop down boxes in Qnet Point Editor. [#4581](https://github.com/USGS-Astrogeology/ISIS3/issues/4581)
 - Added slope, local normal, and ellipsoid normal calculations to phocube. [#3635](https://github.com/USGS-Astrogeology/ISIS3/issues/3645)
+- Added additional translation files for TGO CaSSiS in order to support PSA compliant labels. [#4567](https://github.com/USGS-Astrogeology/ISIS3/issues/4567)
+
+### Deprecated
+- Deprecated edrget as discussed in [#3313](https://github.com/USGS-Astrogeology/ISIS3/issues/3313).
 
 ## [6.0.0] - 2021-08-27
 

isis/src/base/apps/edrget/main.cpp

@@ -14,6 +14,12 @@ using namespace Isis;
 using namespace std;
 
 void IsisMain() {
+  std::cout << "\n*********************************** WARNING ***********************************\n"
+    " This program is deprecated and will be made unavailable in a future release of\n"
+    " ISIS.  A brief discussion that lead to this decision can be found at          \n"
+    " https://github.com/USGS-Astrogeology/ISIS3/issues/3313.  Users who require    \n"
+    " similar functionality are encouraged to explore wget as a replacement.        \n"
+    "*******************************************************************************\n" << '\n';
 
   // Get the file name from the GUI
   int timeOut = 60000;