add script to compile under go 1.10

test/compile_with_go110.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# This test checks that we can correctly "go get" and then use the go-arg package
+# under go 1.10, which was the last release before introduction of the new go
+# module system.
+
+docker run \
+    --rm \
+    -v $(pwd)/some-program:/src \
+    -w /src \
+    golang:1.10 \
+    bash -c "go get github.com/alexflint/go-arg && go build -o /dev/null"

test/compile_with_go111.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+# This test checks that we can compile some code that depends on go-arg when using go 1.11 
+# with the new go module system active.
+
 docker run \
     --rm \
     -v $(pwd)/some-program:/src \

test/compile_with_go111_inside_gopath.sh

@@ -1,12 +1,11 @@
 #!/bin/bash
 
-# Under go 1.11, modules are disabled by default when user code is located within the GOPATH.
-# In this test, we check that we can correctly "go get" the go-arg package, and then compile
-# some code that uses it.
+# This test checks that we can correctly "go get" and then use the go-arg package using
+# go 1.11 when the code is within the GOPATH (in which case modules are disabled by default).
 
 docker run \
     --rm \
     -v $(pwd)/some-program:/go/src/some-program \
     -w /go/src/some-program \
     golang:1.11 \
-    bash -c "go get github.com/alexflint/go-arg && go build"
+    bash -c "go get github.com/alexflint/go-arg && go build -o /dev/null"