Update working version to Babeltrace 2.0.1

This is not the _release_ commit of Babeltrace 2.0.1; it merely
updates the current working version to 2.0.1.

Since this commit is not tagged, the `git describe`
output (e.g. v2.0.0-1-g7adcb97be) will be included as part of the
library's "development stage" version field.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Iad8006929c97d72ebfed7cd683bcaa85c59f9c56

configure.ac

@@ -28,7 +28,7 @@ AC_PREREQ([2.50])
 
 m4_define([bt_version_major], [2])
 m4_define([bt_version_minor], [0])
-m4_define([bt_version_patch], [0])
+m4_define([bt_version_patch], [1])
 m4_define([bt_version_dev_stage], [])
 m4_define([bt_version], bt_version_major[.]bt_version_minor[.]bt_version_patch[]bt_version_dev_stage)
 m4_define([bt_version_name], [Amqui])