Use relative include path, fixes #15

9 jobs for include-fix in 6 minutes and 39 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed clang-c++11 #79725
Linux

00:04:09

passed cppcheck #79727
Linux

00:06:38

passed doc #79732
Linux

00:00:12

passed gcc-c++11 #79724
Linux

00:04:08

passed macos-c++11 #79726
Apple

00:03:09

passed VS2015-32-bit #79731
VS2015

00:01:17

passed VS2015-64-bit #79730
VS2015

00:01:32

passed VS2017-32-bit #79729
VS2017

00:01:22

passed VS2017-64-bit #79728
VS2015

00:01:42