Fixed some typos/grammar issues

README.md

@@ -1,6 +1,6 @@
 ## About Sublist3r 
 
-Sublist3r is python tool that is designed to enumerate subdomains of websites through OSINT. It helps penetration testers and bug hunters collect and gather subdomains for the domain they are targeting. Sublist3r enumerates subdomains using many search engines such as Google, Yahoo, Bing, Baidu, and Ask. Sublist3r also enumerates subdomains using Netcraft, Virustotal, ThreatCrowd, DNSdumpster and ReverseDNS.
+Sublist3r is a python tool designed to enumerate subdomains of websites using OSINT. It helps penetration testers and bug hunters collect and gather subdomains for the domain they are targeting. Sublist3r enumerates subdomains using many search engines such as Google, Yahoo, Bing, Baidu, and Ask. Sublist3r also enumerates subdomains using Netcraft, Virustotal, ThreatCrowd, DNSdumpster, and ReverseDNS.
 
 [subbrute](https://github.com/TheRook/subbrute) was integrated with Sublist3r to increase the possibility of finding more subdomains using bruteforce with an improved wordlist. The credit goes to TheRook who is the author of subbrute.
 
@@ -24,7 +24,7 @@ Sublist3r currently supports **Python 2** and **Python 3**.
 
 ## Dependencies:
 
-Sublist3r depends on the `requests`, `dnspython` and `argparse` python modules.
+Sublist3r depends on the `requests`, `dnspython`, and `argparse` python modules.
 
 These dependencies can be installed using the requirements file: