v2.7.8: Fix issues related to struct par reading

fix reading struct_pars

v2.7.7: UDT array input and output

update readme file

v2.7.6: Fix fail to build package for windows

fix operation cancel and timeout for windows

v2.7.5: Fix operation cancel and timeout

fix operation cancel and timeout

v2.7.4: use global value timeout to avoid blocking read/write

add timeout to read/write operation

v2.7.3: use database/sql failover + add support for RC4

update README.md

v2.7.2: Use golang struct as an oracle output parameters

update README.md

v2.7.1: use golang struct as oracle (input) parameters

using struct pars

v2.6.17: Implement Bulk(Insert/Merge) in ExecContext

update examples and README.md file

v2.6.16: Fix issue in parseSqlText function

update README.md file