Release 2.4.9 (sofastack#231)

Release 2.4.8 (sofastack#216)

* release 2.4.8

Degrade bolt to 1.4.4. (sofastack#203)

Upgrade version 2.4.6 (sofastack#201)

* upgrade version to 2.4.6

prepare to release (sofastack#189)

Change version 2.4.4-SNAPSHOT to 2.4.4 for release. (sofastack#172)

change sofa boot version to 2.4.3 (sofastack#119)

fix readme (sofastack#115)

update version to 2.4.1 (sofastack#101)

Merge branch 'master' into master