v. 2.0

• Remove boost dependency for local only sessions (issue #83)
• Now you can use standalone asio library instead of boost asio for remote sessions (issue #41)
• Fix missing echo after ctrl-v paste of command (issue #72)
• Remove the symbol BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT (issue #89)
• Fix unused parameters warning in release mode (issue #90)
• Cli constructor revision (issue #75)
• Special keys not recognized behaves like backspace in windows (issue #111)
• Fix cmake install dependencies (issue #117)