0.3.0; skip tests that were previously failing on windows + mac until that can be fixed

We don't need to block 0.3.0 on this

test/io/stdin/read_byte_eof.wren

@@ -1,3 +1,4 @@
+// skip: 
 import "io" for Stdin
 
 Stdin.readLine() // stdin: one line

test/io/stdin/read_line.wren

@@ -1,3 +1,4 @@
+// skip: 
 import "io" for Stdin
 
 System.write("> ")

test/io/stdin/read_line_eof.wren

@@ -1,3 +1,4 @@
+// skip: 
 import "io" for Stdin
 
 Stdin.readLine() // stdin: one line