Merge pull request #1296 from taosdata/release/v1.6.5.6

[update version info]

src/util/src/version.c

-char version[64] = "1.6.5.5";
+char version[64] = "1.6.5.6";
 char compatible_version[64] = "1.6.0.0";
-char gitinfo[128] = "4ad876d4b466566c82661b4120a8c14354c57d96";
+char gitinfo[128] = "c72802f133a6b75ae58b0f6a588e52c500f6ee50";
 char gitinfoOfInternal[128] = "da88f4a2474737d1f9c76adcf0ff7fd0975e7342";
-char buildinfo[512] = "Built by root at 2020-02-19 19:16";
+char buildinfo[512] = "Built by root at 2020-03-02 16:05";
 
-void libtaos_1_6_5_5_Linux_x64() {};
+void libtaos_1_6_5_6_Linux_x64() {};