[RFC] Version 0.90 release candidate (#4475)

* Release 0.90

* Add script to automatically generate acknowledgment

* Update NEWS.md

tests/ci_build/doxygen.sh

@@ -1,9 +1,19 @@
 #!/bin/bash
+
+if [ $# -ne 1 ]; then
+  echo "Usage: $0 [branch name]"
+  exit 1
+fi
+
 set -e
 set -x
 
+branch_name=$1
+
 rm -rf build
 mkdir build
 cd build
 cmake .. -DBUILD_C_DOC=ON
 make -j
+
+tar cvjf ${branch_name}.tar.bz2 doc_doxygen/