fix grammar error and upload pdf

Author: mmicu

Makefile

@@ -1,13 +1,18 @@
+.DEFAULT_GOAL := all
+
 INPUT_FILE = README.md
 OUTPUT_FILE = artifacts/python-for-coding-interview.pdf
 
 .PHONY: linter
 linter:
-markdownlint README.md --disable MD013 MD025
+markdownlint $(INPUT_FILE) --disable MD013 MD025
 
 .PHONY: pdf
 pdf:
 pandoc $(INPUT_FILE) \
 --pdf-engine=xelatex \
 -M date="`date "+%B%e, %Y"`" \
 -o $(OUTPUT_FILE)
+
+.PHONY: all
+all: linter pdf

README.md

@@ -9,7 +9,7 @@ geometry: margin=1in
 This guide includes a list of several and useful `Python` data structures to know for coding interviews.
 
 It is intended to show the main data structures incorporated in the language
-and their useful functions. More advance `Python` feature will not be shown here.
+and their useful functions. More advance `Python` features will not be shown here.
 
 Additional material: