Update dependency library.
Update dependency library.

Update Athens-SR2 https://github.com/spring-io/platform/compare/vAthens-SR1...vAthens-SR2
* org.springframework.boot:1.4.3.RELEASE from 1.4.2

And
* Guava 21.0
* OkHttp 3.5.0

EijiFukawa/linebeacontest1,imamrinjani/percobaan2,speedk0re/kitchenstank,hlmaab/Line-chatbot-for-COMP3111,kv19971/Line-chatbot-for-COMP3111,zysjimmy/Line-chatbot-for-COMP3111,eatnoodles/LineBotCC,line/line-bot-sdk-java,williamchand/linebotsdk,okzapradhana/line-bot-sdk-java,zysjimmy/Line-chatbot-for-COMP3111,infowarnet/javaline,line/line-bot-sdk-java,xzhangbx/Line-chatbot-for-COMP3111,MaxBai/line-bot-test-one,line/line-bot-sdk-java,RinoSato/test1,sangatu/linebot334,yunagi111/yunagi,yassineamira007/line-bot-sdk-java,c963951/briantest,ryukakusan/Kitchensink,xzhangbx/Line-chatbot-for-COMP3111,xinmi/ASK,Jekyll-SONG/Line-chatbot-for-COMP3111,xyaoab/Line-chatbot-for-COMP3111,ZilvexRC/Line-chatbot-for-COMP3111,line/line-bot-sdk-java,And-C/Line-chatbot-for-COMP3111,austin0910/line-bot-java-english-only,xgaoak/COMP,locheng2016/ask,PilerMakier/Line-chatbot-for-COMP3111,KevinYobeth/XIIpaokBOT,piersimak/Werewolf,WangPrimo/LineBot,Jekyll-SONG/Line-chatbot-for-COMP3111