How To Get All Package's Code Coverage together In Golang?

I have a library consisting of several packages. When running tests, I am using '-cover' flag and its showing the coverage information for each package individually.Like follows:

--- PASS: TestSampleTestSuite (0.00s)
PASS
coverage: 28.7% of statements
ok      http://ift.tt/1LHekoF 13.021s
?       http://ift.tt/1Q0sc0g [no test files]

=== RUN   TestAbc
--- PASS: TestAbc (0.43s)
PASS
coverage: 27.7% of statements

Is there any way to get a full coverage overview easily to get good idea about coverage on the whole project?