docs: Prepare release of version 2.1

Change-Id: I3694a8791b9540fc1b926a83ff55421b47e0f1b1
Refs: #3151
diff --git a/.jenkins.d/00-prepare.sh b/.jenkins.d/00-prepare.sh
index 67e579f..57ddf70 100755
--- a/.jenkins.d/00-prepare.sh
+++ b/.jenkins.d/00-prepare.sh
@@ -4,7 +4,7 @@
 
 git rm -qrf .
 git clone --depth=1 https://github.com/named-data-ndnSIM/ns-3-dev ns-3
-git clone --depth=1 https://github.com/named-data-ndnSIM/pybindgen.git pybindgen
+git clone https://github.com/named-data-ndnSIM/pybindgen.git pybindgen
 mkdir -p ns-3/src/ndnSIM
 mv .git ns-3/src/ndnSIM/
 (cd ns-3/src/ndnSIM/ && git reset -q && git checkout . && git submodule update --init)