Merge pull request #171 from Geod24/deprecation

Clean up std.json deprecation, remove DUB hack in CI
merged-on-behalf-of: Sönke Ludwig <s-ludwig@users.noreply.github.com>

.travis.yml

@@ -41,8 +41,7 @@ branches:
     - master
 
 before_install:
-  # Use the dub-updating fork of the installer script until https://github.com/dlang/installer/pull/301 is merged
-  - wget https://raw.githubusercontent.com/wilzbach/installer-dub/master/script/install.sh -O ~/dlang/install.dub.sh
+  - wget https://dlang.org/install.sh -O ~/dlang/install.dub.sh
   - . $(bash ~/dlang/install.dub.sh -a dub)
   - dub --version
 

source/vibe/core/args.d

@@ -301,7 +301,13 @@ private void init()
 private T fromValue(T)(in JSONValue val)
 {
 	import std.conv : to;
-	static if (is(T == bool)) return val.type == JSON_TYPE.TRUE;
+	static if (is(T == bool)) {
+        // JSONType.TRUE has been deprecated in v2.087.0
+        static if (is(typeof(JSONType.true_)))
+            return val.type == JSONType.true_;
+        else
+            return val.type == JSON_TYPE.TRUE;
+    }
 	else static if (is(T : long)) return val.integer.to!T;
 	else static if (is(T : double)) return val.floating.to!T;
 	else static if (is(T == string)) return val.str;