Update README.md

Author: igorkulman

README.md

@@ -30,15 +30,15 @@ The [Lexer](PascalInterpreter/PascalInterpreter/Lexer/Lexer.swift) reads the Pas
 
 ### Parser
 
-The [Parser](PascalInterpreter/PascalInterpreter/Parser/Parser.swift) reads the sequence of tokens produced by the Lexer and builds an [Abstract Syntax Tree representation](PascalInterpreter/PascalInterpreter/Parser/AST.swift)(AST for short) of the Pascal program according to the [grammar](grammar.md). 
+The [Parser](PascalInterpreter/PascalInterpreter/Parser/Parser.swift) reads the sequence of tokens produced by the Lexer and builds an [Abstract Syntax Tree representation](PascalInterpreter/PascalInterpreter/Parser/AST.swift) (AST for short) of the Pascal program according to the [grammar](grammar.md). 
 
 You can see what the AST looks like in the [unit tests](PascalInterpreter/PascalInterpreterTests/ParserTests.swift) or in the Playground where you can also use the `printTree()` method on any AST to see its visual representation printed into the console.
 
 ![Parser](Images/parser.png)
 
 ### Semantic analyzer
 
-The [Semantic analyzer](PascalInterpreter/PascalInterpreter/Semantic%20analyzer/SemanticAnalyzer.swift) does static semantic checks on the Pascal program AST. It currently checks if all the used variables are declared beforehand and if there are any duplicate declarations. The result of semantic analysis is a [Symbol table](PascalInterpreter/PascalInterpreter/Semantic%20analyzer/SymbolTable.swift) that holds all the symbols used by a Pascal program, currently built in types (Integer, Real) and declared variable names. 
+The [Semantic analyzer](PascalInterpreter/PascalInterpreter/Semantic%20analyzer/SemanticAnalyzer.swift) does static semantic checks on the Pascal program AST. It currently checks if all the used variables are declared beforehand and if there are any duplicate declarations. The result of semantic analysis is a [Symbol table](PascalInterpreter/PascalInterpreter/Semantic%20analyzer/SymbolTable.swift) that holds all the symbols used by a Pascal program, currently built in types (Integer, Real, Boolean, String) and declared variable names. 
 
 Implemented checks