Add punctuation to please godoc (#197)

Fixes issue reported over at golang/go#55888

godotenv.go

@@ -30,15 +30,15 @@ const doubleQuoteSpecialChars = "\\\n\r\"!$`"
 
 // Load will read your env file(s) and load them into ENV for this process.
 //
-// Call this function as close as possible to the start of your program (ideally in main)
+// Call this function as close as possible to the start of your program (ideally in main).
 //
-// If you call Load without any args it will default to loading .env in the current path
+// If you call Load without any args it will default to loading .env in the current path.
 //
-// You can otherwise tell it which files to load (there can be more than one) like
+// You can otherwise tell it which files to load (there can be more than one) like:
 //
 //		godotenv.Load("fileone", "filetwo")
 //
-// It's important to note that it WILL NOT OVERRIDE an env variable that already exists - consider the .env file to set dev vars or sensible defaults
+// It's important to note that it WILL NOT OVERRIDE an env variable that already exists - consider the .env file to set dev vars or sensible defaults.
 func Load(filenames ...string) (err error) {
 	filenames = filenamesOrDefault(filenames)
 
@@ -53,11 +53,11 @@ func Load(filenames ...string) (err error) {
 
 // Overload will read your env file(s) and load them into ENV for this process.
 //
-// Call this function as close as possible to the start of your program (ideally in main)
+// Call this function as close as possible to the start of your program (ideally in main).
 //
-// If you call Overload without any args it will default to loading .env in the current path
+// If you call Overload without any args it will default to loading .env in the current path.
 //
-// You can otherwise tell it which files to load (there can be more than one) like
+// You can otherwise tell it which files to load (there can be more than one) like:
 //
 //		godotenv.Overload("fileone", "filetwo")
 //
@@ -124,15 +124,15 @@ func Parse(r io.Reader) (envMap map[string]string, err error) {
 	return
 }
 
-//Unmarshal reads an env file from a string, returning a map of keys and values.
+// Unmarshal reads an env file from a string, returning a map of keys and values.
 func Unmarshal(str string) (envMap map[string]string, err error) {
 	return Parse(strings.NewReader(str))
 }
 
 // Exec loads env vars from the specified filenames (empty map falls back to default)
 // then executes the cmd specified.
 //
-// Simply hooks up os.Stdin/err/out to the command and calls Run()
+// Simply hooks up os.Stdin/err/out to the command and calls Run().
 //
 // If you want more fine grained control over your command it's recommended
 // that you use `Load()` or `Read()` and the `os/exec` package yourself.
@@ -146,7 +146,7 @@ func Exec(filenames []string, cmd string, cmdArgs []string) error {
 	return command.Run()
 }
 
-// Write serializes the given environment and writes it to a file
+// Write serializes the given environment and writes it to a file.
 func Write(envMap map[string]string, filename string) error {
 	content, err := Marshal(envMap)
 	if err != nil {