Disallow escaped forward slash

Updated ABNF and tests

Author: antonmedv

spec/v0.1/maml.abnf

@@ -39,7 +39,7 @@ integer = "0" / ( onenine *DIGIT )
 quote = %x22
 
 char =  %x20-21 / %x23-5B / %x5D-10FFFF
-char =/ %x5C ( %x5C / quote / "/" / "n" / "r" / "t" / "u" "{" 1*6HEXDIG "}" )
+char =/ %x5C ( %x5C / quote / "n" / "r" / "t" / "u" "{" 1*6HEXDIG "}" )
 
 comment = "#" *non-eol
 

spec/v0.1/maml.test.js

@@ -123,7 +123,8 @@ describe('MAML v0.1', () => {
     parse(`"\\""`)
     parse(`"\\u{10FFFF}"`)
 
-    expect(() => parse(`"\\`)).toThrow()
+    expect(() => parse(`"\\"`)).toThrow()
+    expect(() => parse(`"\\/"`)).toThrow()
     expect(() => parse(`"\n"`)).toThrow()
     expect(() => parse(`"\\u0000"`)).toThrow()
     expect(() => parse(`"\\u{G}"`)).toThrow()