Update Travis setup to compile with up to 23.0. Update Rebar

.travis.yml

@@ -1,9 +1,23 @@
 language: erlang
-script: "make test"
+
+os: linux
+
+dist: xenial
+
+before_install:
+  - pip install --user cpp-coveralls coveralls-merge
+
+install:
+  - rebar get-deps
+
+script: rebar compile && rebar skip_deps=true eunit
+
+after_success:
+  - cpp-coveralls --exclude lib --exclude tests --gcov-options '\-lp' --dump c.json
+  - coveralls-merge c.json erlang.json
+
 otp_release:
-  - 18.0
-  - 17.4
-  - 17.3
   - R16B03-1
-  - R15B03
-  - R14B04
+  - 17.3
+  - 19.3
+  - 23.0

rebar.config

@@ -3,6 +3,7 @@
               {"darwin", "priv/sqlite3_drv.so", ["c_src/*.c", "sqlite3_amalgamation/*.c"]}]}.
 {port_env, [{"DRV_CFLAGS", "$DRV_CFLAGS -Wall -Wextra -Wno-unused-parameter -Wstrict-prototypes"},
             {"DRV_LDFLAGS", "$DRV_LDFLAGS -lsqlite3"},
+            {"ERL_LDFLAGS", " -L$ERL_EI_LIBDIR -lei"},
             {"darwin", "DRV_CFLAGS", "$DRV_CFLAGS -Wall -Wextra -Wno-unused-parameter -Wstrict-prototypes"},
             {"darwin", "DRV_LDFLAGS", "$DRV_LDFLAGS"},
             {".*win32.*", "DRV_CFLAGS", "$DRV_CFLAGS /O2 /Isqlite3_amalgamation /Ic_src /W4 /wd4100 /wd4204 /wd4820 /wd4255 /wd4668 /wd4710 /wd4711"},