test Nim 1.4.0 support

Author: treeform

.github/workflows/build.yml

@@ -6,12 +6,15 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
+        nim-version: ['1.4.0', '1.4.x', 'stable']
 
     runs-on: ${{ matrix.os }}
 
     steps:
     - uses: actions/checkout@v2
     - uses: jiro4989/setup-nim-action@v1
+      with:
+        nim-version: ${{ matrix.nim-version }}
     - run: nimble test -y
     - run: nimble test --gc:orc -y
     - run: nim js -r tests/all.nim

tests/test_options.nim

@@ -7,8 +7,8 @@ var
 doAssert a.toJson() == """123"""
 doAssert b.toJson() == """null"""
 
-doAssert $("""1""".fromJson(Option[int])) == "some(1)"
-doAssert $("""null""".fromJson(Option[int])) == "none(int)"
+doAssert """1""".fromJson(Option[int]) == some(1)
+doAssert """null""".fromJson(Option[int]) == none(int)
 
 proc check[T](v: T) =
   var v2 = some(v)