add a requirements.txt file and prereq make target, confirm test of latest PRs

Makefile

@@ -8,6 +8,9 @@ GOGET=$(GOCMD) get
 
 DIRS=`go list ./...`
 
+PYTHON=python3
+PIP=$(PYTHON) -m pip
+
 all: build
 
 build: 
@@ -46,6 +49,16 @@ gopath-update: export GO111MODULE = off
 gopath-update:
 	@echo "GO111MODULE = $(value GO111MODULE)"
 	go get -u ./...
+
+prereq:
+	@echo "Installing python prerequisites -- ignore err if already installed:"
+	- $(PIP) install -r requirements.txt
+	@echo
+	@echo "if this fails, you may see errors like this:"
+	@echo "    Undefined symbols for architecture x86_64:"
+	@echo "    _PyInit__gi, referenced from:..."
+	@echo
+
 	
 # NOTE: MUST update version number here prior to running 'make release' and edit this file! 
 VERS=v0.4.7

go.sum

@@ -4,9 +4,12 @@ github.com/gonuts/flag v0.1.0 h1:fqMv/MZ+oNGu0i9gp0/IQ/ZaPIDoAZBOBaJoV7viCWM=
 github.com/gonuts/flag v0.1.0/go.mod h1:ZTmTGtrSPejTo/SRNhCqwLTmiAgyBdCkLYhHrAoBdz4=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 golang.org/x/mod v0.9.0 h1:KENHtAZL2y3NLMYZeHY9DW8HW8V+kQyJsY/V9JlKvCs=
 golang.org/x/mod v0.9.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/net v0.8.0/go.mod h1:QVkue5JL9kW//ek3r6jTKnTFis1tRmNAW2P1shuFdJc=
 golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/tools v0.7.0 h1:W4OVu8VVOaIO0yzWMNdepAulS7YfoS3Zabrm8DOXXU4=