Fix CI tests that dependended on Node 10 (#582)

These tests use >= version requirements, so they would break whenever
new major versions are released. That's not really necessary, so this
removes the bits that will continually break.

test/run

@@ -584,7 +584,7 @@ testDangerousRangeStar() {
   compile "dangerous-range-star"
   assertCaptured "Dangerous semver range"
   assertCaptured "Resolving node version *"
-  assertCaptured "Downloading and installing node 10."
+  assertCaptured "Downloading and installing node"
   assertCapturedError
 }
 
@@ -592,14 +592,14 @@ testDangerousRangeGreaterThan() {
   compile "dangerous-range-greater-than"
   assertCaptured "Dangerous semver range"
   assertCaptured "Resolving node version >0.4"
-  assertCaptured "Downloading and installing node 10."
+  assertCaptured "Downloading and installing node"
   assertCapturedError
 }
 
 testRangeWithSpace() {
   compile "range-with-space"
   assertCaptured "Resolving node version >= 0.8.x"
-  assertCaptured "Downloading and installing node 10."
+  assertCaptured "Downloading and installing node"
   assertCapturedSuccess
 }