Updates docs regarding golang usage and deps

Signed-off-by: Sotiris Nanopoulos <sonanopo@microsoft.com>

Makefile

@@ -53,15 +53,15 @@ check-go-version: # Ensure the Go version used is what OSM requires
 	@if [ $(GO_VERSION_MAJOR) -gt $(MIN_REQUIRED_GO_VERSION_MAJOR) ]; then \
 		exit 0 ;\
 	elif [ $(GO_VERSION_MAJOR) -lt $(MIN_REQUIRED_GO_VERSION_MAJOR) ]; then \
-		@echo -e '$(GO_VERSION_MESSAGE)';\
+		echo -e '$(GO_VERSION_MESSAGE)';\
 		exit 1; \
 	elif [ $(GO_VERSION_MINOR) -gt $(MIN_REQUIRED_GO_VERSION_MINOR) ] ; then \
 		exit 0; \
 	elif [ $(GO_VERSION_MINOR) -lt $(MIN_REQUIRED_GO_VERSION_MINOR) ] ; then \
-		@echo -e '$(GO_VERSION_MESSAGE)';\
+		echo -e '$(GO_VERSION_MESSAGE)';\
 		exit 1; \
 	elif [ $(GO_VERSION_PATCH) -lt $(MIN_REQUIRED_GO_VERSION_PATCH) ] ; then \
-		@echo -e '$(GO_VERSION_MESSAGE)';\
+		echo -e '$(GO_VERSION_MESSAGE)';\
 		exit 1; \
 	fi
 

docs/content/docs/dev_guide/_index.md

@@ -70,7 +70,7 @@ OSM leverages [Envoy proxy](https://github.com/envoyproxy/envoy) as a data plane
 
 ## Get Go-ing
 
-This Open Service Mesh project uses [Go v1.15](https://golang.org/). If you are not familiar with Go, spend some time with the excellent [Tour of Go](https://tour.golang.org/).
+This Open Service Mesh project uses [Go v1.15.7+](https://golang.org/). If you are not familiar with Go, spend some time with the excellent [Tour of Go](https://tour.golang.org/).
 
 ## Get the dependencies
 
@@ -80,6 +80,8 @@ Take a peek at the `go.mod` file in the root of this repository to see all depen
 
 Run `go get -d ./...` to download all required Go packages.
 
+Also the project requires Docker. See how to install Docker [here].(https://docs.docker.com/engine/install/)
+
 #### Makefile
 
 Many of the operations within the OSM repo have GNU Makefile targets.