Only download transactions for the last year

Some FIs don't return *any* transactions if you ask them for *all* of
them since the beginning of (UNIX) time...

cmd/ofx/bankdownload.go

@@ -54,7 +54,7 @@ func download() {
 			AcctId:   ofxgo.String(acctId),
 			AcctType: ofxgo.String(acctType),
 		},
-		DtStart: ofxgo.Date(time.Unix(0, 0)),
+		DtStart: ofxgo.Date(time.Now().AddDate(-1, 0, 0)),
 		DtEnd:   ofxgo.Date(time.Now()),
 		Include: true,
 	}

cmd/ofx/banktransactions.go

@@ -39,7 +39,7 @@ func bankTransactions() {
 			AcctId:   ofxgo.String(acctId),
 			AcctType: ofxgo.String(acctType),
 		},
-		DtStart: ofxgo.Date(time.Unix(0, 0)),
+		DtStart: ofxgo.Date(time.Now().AddDate(-1, 0, 0)),
 		DtEnd:   ofxgo.Date(time.Now()),
 		Include: true,
 	}

cmd/ofx/ccdownload.go

@@ -48,7 +48,7 @@ func ccDownload() {
 		CCAcctFrom: ofxgo.CCAcct{
 			AcctId: ofxgo.String(acctId),
 		},
-		DtStart: ofxgo.Date(time.Unix(0, 0)),
+		DtStart: ofxgo.Date(time.Now().AddDate(-1, 0, 0)),
 		DtEnd:   ofxgo.Date(time.Now()),
 		Include: true,
 	}

cmd/ofx/cctransactions.go

@@ -35,7 +35,7 @@ func ccTransactions() {
 		CCAcctFrom: ofxgo.CCAcct{
 			AcctId: ofxgo.String(acctId),
 		},
-		DtStart: ofxgo.Date(time.Unix(0, 0)),
+		DtStart: ofxgo.Date(time.Now().AddDate(-1, 0, 0)),
 		DtEnd:   ofxgo.Date(time.Now()),
 		Include: true,
 	}

cmd/ofx/invdownload.go

@@ -52,7 +52,7 @@ func invDownload() {
 			BrokerId: ofxgo.String(brokerId),
 			AcctId:   ofxgo.String(acctId),
 		},
-		DtStart:        ofxgo.Date(time.Unix(0, 0)),
+		DtStart:        ofxgo.Date(time.Now().AddDate(-1, 0, 0)),
 		DtEnd:          ofxgo.Date(time.Now()),
 		Include:        true,
 		IncludeOO:      true,

cmd/ofx/invtransactions.go

@@ -38,7 +38,7 @@ func invTransactions() {
 			BrokerId: ofxgo.String(brokerId),
 			AcctId:   ofxgo.String(acctId),
 		},
-		DtStart:        ofxgo.Date(time.Unix(0, 0)),
+		DtStart:        ofxgo.Date(time.Now().AddDate(-1, 0, 0)),
 		DtEnd:          ofxgo.Date(time.Now()),
 		Include:        true,
 		IncludeBalance: true,