Merge pull request #39 from lanzhihao/patch-3

Update getting_started_with_arduino_ide.md

docs/getting_started_with_arduino_ide.md

@@ -51,7 +51,7 @@ The Duo is installed the customed Particle firmware by default during manufactur
 
 ## <span id="update-system-firmware">Update System Firmware</span>
 
-You are supposed to check the [board package change-log](duo_arduino_board_package_changelog.md) to see if there is a new released version of the board package. If available, you can simply follow the [Arduino Board Package Installation Guide](arduino_board_package_installation_guide.md) to update the board package to the latest version. 
+You are supposed to check the [Arduino Board Package Change-log](https://github.com/redbear/STM32-Arduino/blob/master/CHANGELOG.md) to see if there is a new released version of the board package. If available, you can simply follow the [Arduino Board Package Installation Guide](arduino_board_package_installation_guide.md) to update the board package to the latest version. 
 
 Since Duo board package v0.2.5, there is always a copy of the Duo's system firmware within the package. According to the board package change-log, it declares which version of the system firmware that should be compatible with applications developed based on the corresponding board package. If you've worked through the [Out-of-Box Experience](out_of_box_experience.md), you should have known the system firmware version of your Duo. If not, 
 
@@ -106,4 +106,4 @@ Permission is hereby granted, free of charge, to any person obtaining a copy of
 
 The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.